The One With The Donor
Joey arranges for a reluctant Rachel to help Charlie shop for some new clothes. Phoebe comes along as well, and Charlie overhears Phoebe and Rachel talk about Rachel's feelings for Joey; but Charlie thinks it was Phoebe who has feelings for him. Phoebe is invited to a party which Mike will also be attending, and stresses about looking great but pretending to be over him. But on her way, she runs into her old flame, David (the Scientist guy), and changes her plans. Ross has a chance to be the keynote speaker at a Paleontology convention in Barbados; when he's making his pitch to the deciding professor, it puts him to sleep. Chandler and Monica visit their Doctor about reproductive options, and begin searching for a sperm donor. Chandler invites a likely but unsuspecting candidate (Zack) to dinner, and he gets a little creeped out by the odd questions Chandler and Monica are asking. In the end they decide to adopt.
Zack: I'm gonna take off now. You're gonna let me go home, aren't you?
Chandler: You sure you don't wanna stick around a little longer?
Zack: No, no, I should get home, I'm kinda tired.
Chandler: Are you just tired now or are you always tired, 'cause that could be a sign of clinical depression.
Zack: No it's just tiring having to figure out the age at which all my grandparents died. I'll see you tomorrow.
Clare just took off without saying goodbye．
与其相近的词或词组有：depart，disappear，exit，get off，get out，go，go away，go off，leave，take leave of，quit，set out，withdraw，vacate．
take off除了指离开之外，还有许多其他常用的词义。在take sth．off中可指“脱下、除去某物”，例如：
I forgot to take off my make up last night．
took 20 percent off则指扣去20％。take off也可指为了逗笑而模仿(copy)某人的谈吐举止，这也是一种非正式用法，例如：
When the teacher came into the classroom，he was trying to take off the ridiculous behavior of the teacher in class．
take a day off词组中，take off意为“休假”，如：
I am taking Thursday off to do some Christmas shopping
I hear the business is really taking off．
a Hew movie that really took off指的是“一部非常火的新电影”。