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According to ¡y¤¤¦{¬£¡z, ¥ª»²¡B¥k´]¡F¤Ñ»í¡B¤Ñൠis »²Â`¡C»²Â`¥D¥L¤O¡A¦p¨Ó¦Û¥L¤Hªº§U¤O¡BÀ°§Uµ¥¡C
That means external factor, no ¥|¤Æ ov<@q ©½t¥Í³N¼Æ¬ã¨sªÀ -- ³N¼Æ¬ã¨s¡@¡@ Y ¤å©÷¡B¤å¦±¡Fis ¦õÂ`, ¦õÂ`¥D¦Û¤O¡An¦Û¤w effort ¤~¦¨oB@J ©½t¥Í³N¼Æ¬ã¨sªÀ -- ³N¼Æ¬ã¨s¡@¡@ h=>* That means internal factor, has ¥|¤Æ ovRR
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