本集简介：

The One Where Rachel's Sister Baby-sits

Monica and Chandler ask Rachel to write a letter of recommendation to their adoption agency; Joey feels left out because they didn't ask him, so they do. After a botched attempt to write a good letter, he does a re-write and drops it off without showing it to them first. The adoption agency thinks it's wonderful that they had a "child" write their recommendation. Phoebe unknowingly ridicules every idea Mike has for proposing to her. He finally does it the right way - he gets down on one knee and opens his heart. On Rachel's advice, her sister, Amy, breaks up with her fiance (whom she doesn't love), and temporarily moves in with Rachel. Rachel wants to help Amy be a better, more responsible person, so when Emma's nanny gets sick, Rachel decides to let her take care of Emma for the day. Emma ends up with pierced ears, and Rachel realizes Amy is beyond help.

瑞秋教育她那颇以自我为中心的小妹艾米（Christina Applegate 客串）去追求自己的幸福，为了培养她的责任感，不顾罗斯的反对，让她帮忙照看爱玛。
迈克以“周年纪念日”为由，准备向菲比求婚，但好事多磨。几经周折，他俩终于订婚了。
乔伊帮莫妮卡和钱德给收养中心的人写推荐信，可借助电脑使用艰涩词汇写出的文章令人费解。
瑞秋很快就后悔了自己的决定，因为艾米带爱玛去扎了耳洞。
乔伊用自己的话写的文章赢得了收养中心的人的青睐，因为他们以为那是个孩子写的。

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