任何行為都是有動力的。想吃，想遊泳，想清潔，想八卦來自intrinsic 動力。為了保持體重鍛煉，節食是外動力。

來源: 笑薇. 於 2017-09-25 17:10:00 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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