lemon = something defective 废物，没用的东西

范例对话:
A: Have you seen Joanne's new car yet?
你看见Joanne的新车了吗?

B: Yeah. It looks good, but she's had nothing but problems with it.
车看起来很棒，但是她开车遇到了很多麻烦。

A: That's too bad. It sounds like she got a real lemon.
那太糟糕了。听起来她很没用。

B: She sure did! No sooner did she drive it home from the dealer's than it proved defective and started breaking down.
确实如此，她刚将车从销售商开回家，证明车没问题时，车就出问题了。