Androidアプリにおける Kotlin Coroutines のより良い使い方 / Better Use of Kotlin Coroutines in Android Apps

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େੴক๜-*/&גࣜձࣾ "OESPJEΞϓϦʹ͓͚Δ ,PUMJO$PSPVUJOFTͷΑΓྑ͍࢖͍ํ ,PUMJO'FTU

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ࣗݾ঺հ w େੴক๜!-*/&גࣜձࣾ w ίϛϡχέʔγϣϯΞϓϦ-*/&ͷ "OESPJE൛ͷ։ൃʹैࣄ w ΦʔϓϯιʔεϥΠϒϥϦl-JDIzͷ ϝϯςφʔ w IUUQTHJUIVCDPNMJOFMJDI

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͜ͷηογϣϯͰ࿩͢͜ͱ w ,PUMJO$PSPVUJOFTΛར༻͢ΔࡍͷϕετϓϥΫςΟε w "OESPJEΞϓϦ։ൃʹ͓͍ͯ,PUMJO$PSPVUJOFTΛར༻͢Δࡍʹ஫ҙ͢΂͖ མͱ݀͠ w ,PUMJO$PSPVUJOFTͷجຊతͳ࢖͍ํʹ͍ͭͯ͸࿩͠·ͤΜ w TVTQFOEؔ਺΍'MPXͳͲΛҰ౓͸࢖ͬͨ͜ͱ͕͋ΔલఏͰ࿩͠·͢

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TVTQFOEؔ਺ʹ͍ͭͯ

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TVTQFOEؔ਺Λ࣮૷͢Δࡍͷ஫ҙ఺ w TVTQFOEؔ਺͸lNBJOTBGFzʹ͢Δ w ݺͼग़͢ଆͷίϧʔνϯ͕ͲΜͳεϨου $PSPVUJOF%JTQBUDIFS Ͱ͋ͬ ͯ΋໰୊ͳ͘ಈ࡞͢ΔΑ͏ʹ͢Δ w TVTQFOEؔ਺͸lDBODFMMBCMFzʹ͢Δ w ίϧʔνϯ͕Ωϟϯηϧ͞Εͨͱ͖͸ɺ͙͢ʹॲཧΛதஅ͢Δ

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NBJOTBGFͱ͸ w ϝΠϯεϨουʹඥͮ͘ίϧʔνϯ ྫ͑͹MJGFDZDMF4DPQF͔ΒMBVODI ͞Εͨίϧʔνϯ ͔Β௚઀ݺ͹Εͯ΋໰୊ͳ͍ੑ࣭ͷ͜ͱ w ผͷݴ༿Ͱݴ͑͹ɺXJUI$POUFYU %JTQBUDIFST*0 \ʜ^ͳͲͷར༻Λ ʮݺͼग़͠ଆ͕ߟྀ͠ͳͯ͘΋Α͍ʯΑ͏ʹ͢Δ͜ͱ w NBJOTBGFͳTVTQFOEؔ਺ΛݺͿͱ͖͸%JTQBUDIFST*0͸ෆཁ w NBJOTBGFͳؔ਺಺Ͱ͸ɺΧϨϯτεϨουΛϒϩοΫͯ͠͸ͳΒͳ͍ w ίϧʔνϯΛlTVTQFOEz͢Δͷ͸0,

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$BODFMMBCMFͳTVTQFOEؔ਺ w ίϧʔνϯ͕Ωϟϯηϧ͞Εͨ৔߹ɺ࣮ߦதͷTVTQFOEؔ਺͸ $BODFMMBUJPO&YDFQUJPOΛUISPX͢Δ͜ͱͰॲཧΛதஅ͢΂͖Ͱ͋Δ w ಛʹɺΫϥΠΞϯτΞϓϦͰ͸ʮด͡Δʯ΍ʮ໭Δʯͱ͍ͬͨૢ࡞ʹΑͬͯ Ωϟϯηϧ͕සൟʹൃੜ͢ΔͷͰɺਖ਼͘͠ॲཧΛதஅͰ͖ͳ͚Ε͹ͳΒͳ͍

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TVTQFOEؔ਺ͷجຊతͳ࣮૷ํ਑ w QVCMJDͳTVTQFOEؔ਺͸NBJOTBGF͔ͭDBODFMMBCMFʹͳΔΑ͏৺͕͚Δ w "OESPJE9ͳͲͷஶ໊ͳϥΠϒϥϦ͕ఏڙ͢ΔTVTQFOEؔ਺΋ɺجຊతʹ͜ͷ ੑ࣭Λຬ͍ͨͯ͠Δ w NBJOTBGF͔ͭDBODFMMBCMFͳTVTQFOEؔ਺Λ࣮૷͢Δࡍʹ஫ҙ͢΂͖఺ w $BODFMMBUJPO&YDFQUJPO w ϒϩοΩϯά*0

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ΩϟϯηϧΛਖ਼͘͠ѻ͑ͳ͍ྫ w ͨͱ͑͹ɺӈͷίʔυ͸ίϧʔνϯ ͕Ωϟϯηϧ͞Εͯ΋ɺOVMMΛฦͯ͠ ॲཧΛଓߦͯ͠͠·͏ w $BODFMMBUJPO&YDFQUJPO΍ͦͷ਌Ϋ ϥεͰͷUSZDBUDI͸ආ͚Δ΂͖

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$BODFMMBUJPO&YDFQUJPOΛਖ਼͘͠ѻ͏ ·ͨ͸

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SVO$BUDIJOHͷ࢖༻͸߇͑Δ w SVO$BUDIJOH\ʜ^ͳͲ΋TVTQFOEؔ਺಺Ͱ͸࢖༻Λ߇͑Δ΂͖ w 3FTVMU5Λฦ͢TVTQFOEؔ਺΋ɺίϧʔνϯΩϟϯηϧͷ৔߹͸ $BODFMMBUJPO&YDFQUJPOΛ௚઀UISPX͢Δ΂͖Ͱ͋Δ w DGIUUQTHJUIVCDPN,PUMJOLPUMJOYDPSPVUJOFTJTTVFT w ͦ΋ͦ΋SVO$BUDIJOH͸ɺωοτϫʔΫૢ࡞ʹ͓͚Δ*0&YDFQUJPOͷΑ͏ͳ ʮී௨ʹى͜Γ͏ΔΤϥʔʯͱɺόάʹΑΔ3VOUJNF&YDFQUJPOͷΑ͏ͳʮ૝ ఆ֎ͷো֐ʯͷ۠ผΛࠔ೉ʹͯ͠͠·͏ͨΊɺϏδωεϩδοΫͷίʔυ಺Ͱ ҆қʹ༻͍ͯ͸ͳΒͳ͍

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TVTQFOE$BODFMMBCMF$PSPVUJOFΛ࢖͏ w TVTQFOEؔ਺ΛҰ͔Β࣮૷͢Δ৔߹͸TVTQFOE$BODFMMBCMF$PSPVUJOFؔ਺ Λ࢖͏ w TVTQFOE$BODFMMBCMF$PSPVUJOF\ʜ^ͷϒϩοΫ಺ͰɺΩϟϯηϧ࣌ʹߦ ͏΂͖ॲཧΛJOWPLF0O$BODFMMBUJPOͰࢦఆ͢Δ w TVTQFOE$PSPVUJOFؔ਺͸DBODFMMBCMFͰ͸ͳ͍ͷͰ࢖ͬͯ͸ͳΒͳ͍

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XJUI$POUFYU %JTQBUDIFST*0 ͱΩϟϯηϧ w ϒϩοΩϯά*0 ྫ͑͹lJOQVU4USFBNSFBE zͳͲ ͸ lXJUI$POUFYU %JTQBUDIFST*0 \ʜ^zϒϩοΫͰғ͏͜ͱʹΑͬͯNBJO TBGFʹͰ͖Δ w ϑΝΠϧ*0ͳͲ͸͜Ε͚ͩͰे෼ w ͨͩ͠ɺίϧʔνϯ͕Ωϟϯηϧ͞Εͯ΋*0ૢ࡞ࣗମ͸Ωϟϯηϧ͞Εͳ͍ w )551ΞΫηεͷΑ͏ͳ௕࣌ؒ଴ػ͢ΔՄೳੑͷ͋Δ*0ૢ࡞ʹ͍ͭͯ͸ TVTQFOE$BODFMMBCMF$PSPVUJOFؔ਺ͳͲͱ૊Έ߹ΘͤΔ͜ͱΛߟྀ͢Δ

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-*/&"OESPJEΞϓϦͰͷ࣮૷ྫ IUUQTHJUIVCDPNMJOFMJDICMPCNBTUFSPLIUUQTSDNBJOKBWBDPNMJOFDPSQMJDIPLIUUQ$BMMLU

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/PO$BODFMMBCMFΛద੾ʹར༻͢Δ w ్தͰΩϟϯηϧ͞Εͨ͘ͳ͍ॲཧ͸XJUI$POUFYU /PO$BODFMMBCMF \ʜ^ Ͱғ͏ w Ұ࿈ͷॲཧͷ࠷ޙʹऴྃεςʔλεΛอଘ͢Δ৔߹ͳͲ͕యܕతͳ࢖༻ྫ w /PO$BODFMMBCMFͳϒϩοΫ಺Ͱαʔόʔ΁ͷ)551ΞΫηεͳͲͷ௕࣌ؒ ͔͔ΔॲཧΛ͢Δ͜ͱ͸ආ͚Δ w /PO$BODFMMBCMFΛద੾ʹ༻͍Δ͜ͱͰɺॲཧ్͕தͰΩϟϯηϧ͞Εͯ΋ෆ ਖ਼ͳঢ়ଶ͕࢒Βͳ͍Α͏ʹ͢Δ

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'MPXʹ͍ͭͯ

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'MPXΛ࣮૷͢Δࡍͷ஫ҙ఺ w 'MPXΛฦؔ͢਺͸εϨουηʔϑʹ͠ɺͦΕࣗମ͸෭࡞༻Λ࣋ͨͳ͍Α͏ʹ ͢Δ w ݪଇͱͯ͠ɺฦͨ͠'MPX͕DPMMFDU͞ΕͨλΠϛϯάͰॲཧΛ։࢝͢Δ w 'MPXΛDPMMFDU͍ͯ͠Δίϧʔνϯ͕Ωϟϯηϧ͞ΕͨΒɺ'MPX΋ॲཧΛத அ͢Δ w 4UBUF'MPX΍4IBSFE'MPX͸ɺDPMMFDU͍ͯ͠Δίϧʔνϯ͕Ұͭ΋ͳ͍ͱ͖ TVCTDSJQUJPO$PVOU͕ͷͱ͖ ʹ$16౳ͷϦιʔεΛফඅ͠ͳ͍Α͏ʹ͢Δ

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'MPXΛ࣮૷͢Δ w "OESPJE9ͳͲͷஶ໊ͳϥΠϒϥϦͷఏڙ͢Δ'MPX͸લड़ͷੑ࣭Λຬͨ͢ w ྫ"OESPJE93PPNͷ%"0Ͱ'MPX5Λฦؔ͢਺ w ಠࣗͷ'MPXΛ࣮૷͢Δ৔߹͸ɺ fl PX\ʜ^΍DBMMCBDL'MPX\ʜ^Λ࢖͏͜ͱ Ͱલड़ͷੑ࣭Λຬͨ͢'MPXΛߏஙͰ͖Δ

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DBMMCBDL'MPXؔ਺ͷར༻ྫ

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$PME'MPXͱ)PU'MPX w fl PX\ʜ^΍DBMMCBDL'MPX\ʜ^ʹΑͬͯ࡞ΒΕͨ'MPX͸lDPMEzͱݺ͹ΕΔ w $PME'MPX͸DPMMFDU͞ΕΔͨͼʹ৽ͨʹॲཧ͕࣮ߦ͞ΕΔ w લϖʔδͷ'MPX΋ɺDPMMFDU͞ΕΔͨͼʹ৽ͨʹҐஔ৘ใऔಘॲཧ͕։࢝͞ΕΔ w ҰํͰɺ4UBUF'MPX΍4IBSFE'MPX͸lIPUzͱݺ͹ΕΔ w )PU'MPX͸ಉ࣌ʹෳ਺ͷίϧʔνϯ͔ΒDPMMFDU͞Εͯ΋ɺ࣮ߦ͞ΕΔॲཧ͸ ͚ͭͩ w TUBUF*O΍TIBSF*Oؔ਺ʹΑͬͯ$PME'MPXΛ)PU'MPXʹม׵Ͱ͖Δ

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TUBUF*Oؔ਺ͷར༻ྫ w TUBUF*O΍TIBSF*Oؔ਺ͷҾ਺ʹ͸4IBSJOH4UBSUFE8IJMF4VCTDSJCFEΛࢦఆ ͠ɺDPMMFDU͍ͯ͠Δίϧʔνϯ͕ແ͘ͳͬͨͱ͖ʹಈ࡞Λఀࢭ͢ΔΑ͏ʹ͢Δ w ୹࣌ؒͷTUPQ5JNFPVU.JMMJTΛࢦఆ͢Δ͜ͱͰɺҰॠ͚ͩίϧʔνϯ͕ఀࢭ͢Δ ৔߹ʹఀࢭɾ࠶։͕࿈ଓͯ͠ى͜Δ͜ͱΛ๷͙ "OESPJEΞϓϦͷDPO fi HVSBUJPO DIBOHFͳͲ

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$PSPVUJOF4DPQFͱ $PSPVUJOF%JTQBUDIFSʹ͍ͭͯ

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$PSPVUJOF4DPQFͱϥΠϑαΠΫϧ w ίϧʔνϯΛMBVODI͢ΔΫϥε͸ɺݪଇͱͯͦ͠ͷΠϯελϯεͷϥΠϑαΠΫϧͱҰக͠ ͨ$PSPVUJOF4DPQFΛ࢖ͬͯMBVODI͢Δ͜ͱ w "OESPJE9ͷ"DUJWJUZʹ͸MJGFDZDMF4DPQF͕ɺ7JFX.PEFMʹ͸WJFX.PEFM4DPQF͕ ͋ΔͷͰͦΕΛ࢖͑͹ྑ͍ w "OESPJE9'SBHNFOU͸ྫ֎తʹɺͦΕࣗ਎ͷMJGFDZDMF4DPQFͰ͸ͳ͘ WJFX-JGFDZDMF0XOFSMJGFDZDMF4DPQFΛ࢖͏΂͖Ͱ͋Δ w 'SBHNFOUͱͦͷ7JFXͷϥΠϑαΠΫϧ͕Ұக͍ͯ͠ͳ͍͜ͱʹΑΔ໰୊ w +FUQBDL$PNQPTFͷ-BVODIFE& ff FDUͰ͸ɺͦͷ಺෦Ͱద੾ͳϥΠϑαΠΫϧͷ $PSPVUJOF4DPQFΛ࢖༻͍ͯ͠ΔͷͰɺ໌ࣔతͳࢦఆ͸ෆཁ

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"OESPJE9͕ఏڙ͠ͳ͍Ϋϥεͷ$PSPVUJOF4DPQF w "OESPJE9ͷ؅ཧԼʹͳ͍ΫϥεͰ͋ͬͯ΋ɺͦΕ͕ίϧʔνϯΛMBVODI͢Δͷ Ͱ͋Ε͹$PSPVUJOF4DPQFΛϑΟʔϧυͱͯ࣋ͭ͠΂͖ w Πϯελϯε͕ഁغ͞ΕΔλΠϛϯάͰɺͦͷ$PSPVUJOF4DPQFΛΩϟϯηϧ ͢Δ͜ͱ w $PSPVUJOF4DPQFΛίϯετϥΫλͷσϑΥϧτҾ਺ͱͯ͠༩͑ΔΑ͏ʹ͢Δ ͱVOJUUFTUΛॻ͘ͱ͖ʹศར w 4JOHMFUPOͳΫϥε Ұ౓࡞ΒΕͨΒϓϩάϥϜͷऴྃ·Ͱੜ͖ଓ͚Δ΋ͷ Ͱ͋ͬ ͯ΋ɺͦΕࣗ਎ͷ$PSPVUJOF4DPQFΛఆٛ͢΂͖ w (MPCBM4DPQFΛ࢖͏͜ͱ͸ආ͚Δ

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3FQPTJUPSZΫϥεͷ$PSPVUJOF4DPQFͷྫ w ௨ৗ͸%JTQBUDIFST%FGBVMUΛ࢖͍ɺϝΠϯεϨουͰͷॲཧΛଟ༻͢Δ ৔߹͸.BJO4DPQF ͷར༻Λߟ͑Δ PS

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6OJUUFTUͷྫ w 6OJUUFTUͰ͸ίϯετϥΫλ ͔Β5FTU4DPQFΛJOKFDU͢Δ w BEWBODF6OUJM*EMF Λ࢖ͬͯ ίϧʔνϯͷ࣮ߦλΠϛϯά Λ੍ޚͰ͖Δ

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ಠࣗ$PSPVUJOF%JTQBUDIFS͸࢖Θͳ͍ w ಠࣗͷ$PSPVUJOF%JTQBUDIFSΛ࡞Δ͜ͱ͸ආ͚Δ w LPUMJOYDPSPVUJOFT%JTQBUDIFSTʹఆٛ͞Ε͍ͯΔ΋ͷ͚ͩΛ࢖͏΂͖ w ಛʹɺ&YFDVUPSBT$PSPVUJOF%JTQBUDIFS ʹΑͬͯಠࣗʹ࡞ΒΕͨ EJTQBUDIFSͷڍಈ͸ɺ͋ͳ͕ͨظ଴͍ͯ͠Δ΋ͷͱ͸ҧ͏͔΋͠Εͳ͍

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-*/&"OESPJEΞϓϦͰ࣮ࡍʹى͖ͨ໰୊ w ίϧʔνϯಋೖલ͔Β͋ͬͨίʔυʹɺ4JOHMF5ISFBE&YFDVUPSΛ༻͍Δ ͜ͱͰόοΫάϥ΢ϯυॲཧͷಉ࣮࣌ߦΛ๷ࢭ͍ͯͨ͠΋ͷ͕͋ͬͨ

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ΧελϜ$PSPVUJOF%JTQBUDIFSͰ͸্ख͍͔͘ͳ͍ྫ w ಉ͜͡ͱΛγϯάϧεϨουͷ$PSPVUJOF%JTQBUDIFSͰ΍Ζ͏ͱͯ͠΋ ্ख͍͔͘ͳ͍ w TVTQFOE͍ͯ͠Δؒʹผͷίϧʔνϯ͕࣮ߦ͞ΕΔͨΊ

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.VUFYʹΑΔίϧʔνϯͷഉଞ੍ޚ w ಉ࣌ʹͨͩҰͭͷίϧʔνϯͰͷ࣮ߦΛ͍ͤͨ͞৔߹͸.VUFYΛ࢖͏ w ͜ͷྫͷΑ͏ʹɺ$PSPVUJOF%JTQBUDIFSΛಠࣗʹ࡞Δҙຯ͸΄ͱΜͲແ͍

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SVO#MPDLJOH͸࠷ޙͷखஈ w ίϧʔνϯ͸جຊతʹlDPSPVUJOF4DPQFMBVODI\ʜ^zͷܗͰىಈͤ͞Δ w SVO#MPDLJOH\ʜ^͸Ͱ͖ΔݶΓ࢖Θͳ͍͜ͱ w ಛʹɺϝΠϯεϨου͔ΒSVO#MPDLJOHΛ࢖͏ͱ༰қʹσουϩοΫΛҾ͖ى͜ ͯ͠͠·͏ w SVO#MPDLJOH͸ɺίϧʔνϯʹରԠ͍ͯ͠ͳ͍όοΫάϥ΢ϯυεϨουͰಈ͘ ॲཧ͔ΒTVTQFOEؔ਺Λݺͼग़͢ͱ͖ͷʮ࠷ऴखஈʯͱͯ͠ͷΈ࢖͏ w ΧϨϯτεϨουΛϒϩοΫ͢Δؔ਺͸ld#MPDLJOHzͱ໋໊͢Δ͜ͱʹͯ͠ɺޡͬͯ ϝΠϯεϨου͔Βݺͼग़ͯ͠͠·͏͜ͱΛ๷ࢭ͠Α͏

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"OESPJEΞϓϦͷϥΠϑαΠΫϧ ͱίϧʔνϯ

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"OESPJEͷϥΠϑαΠΫϧͱίϧʔνϯ w "OESPJEͷ"DUJWJUZ͸όοΫάϥ΢ϯυͰ΋TUPQQFEঢ়ଶͰੜ͖ଓ͚Δ w ࠶දࣔ͞Εͨͱ͖ʹঢ়ଶΛૉૣ͘෮ݩ͢ΔͨΊ w ͔͠͠ɺόοΫάϥ΢ϯυͰγεςϜϦιʔεΛফඅ͢Δॲཧ͸ߦ͏΂͖Ͱ͸ ͳ͍ w Ґஔ৘ใऔಘͳͲ͸ϑΥΞάϥ΢ϯυঢ়ଶͰͷΈߦ͏΂͖ w ίϧʔνϯͰͷॲཧ΋"OESPJEͷϥΠϑαΠΫϧΛҙࣝ͢Δඞཁ͕͋Δ

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MBVODI8IFO4UBSUFEͷ໰୊఺ w "DUJWJUZ'SBHNFOU͕TUBSUFEঢ়ଶͷͱ͖͚ͩίϧʔνϯΛಈ࡞ͤ͞ΔͨΊͷ "1*ͱͯ͠MJGFDZDMF4DPQFMBVODI8IFO4UBSUFE΍MJGFDZDMFXIFO4UBSUFE ͱ͍͏ؔ਺͕"OESPJE9ʹ͸͋Δ w ͔͠͠ɺ͜ΕΒΛ࢖ͬͨίϧʔνϯͰ'MPXΛDPMMFDU͢ΔͱTUPQQFEঢ়ଶͰ΋ ॲཧ͕ࢭ·Βͳ͍৔߹͕͋Δͱ͍͏ॏେͳ͕ܽؕ͋Δ w ΑͬͯɺMBVODI8IFO4UBSUFE΍XIFO4UBSUFE͸ʮ࢖ͬͯ͸ͳΒͳ͍ʯ w কདྷͷ"OESPJE9ϦϦʔεͰ࡟আ͞ΕΔ༧ఆ

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SFQFBU0O-JGFDZDMFͷར༻ w "DUJWJUZ'SBHNFOU͕TUBSUFEͷͱ͖͚ͩ'MPXΛDPMMFDU͢Δʹ͸ SFQFBU0O-JGFDZDMFΛ࢖͏

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lXJUIz4UBSUFEؔ਺ͷར༻ w ୯ൃͷίϧʔνϯͰ͋ͬͯ΋ɺϥΠϑαΠΫϧ͕TUBSUFEঢ়ଶͷͱ͖ʹ͚ͩ ॲཧΛ͍ͨ͠৔߹͕͋Δ ྫ'SBHNFOU5SBOTBDUJPODPNNJU ͳͲ w ͦͷΑ͏ͳ৔߹͸ MJGFDZDMFXJUI4UBSUFEΛ࢖͏ w lXIFOz4UBSUFEؔ਺ͱඇৗʹ ฆΒΘ͍͠ͷͰ஫ҙ

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