chaff
n. 糠；谷壳；无价值的东西
vi. 开玩笑；打趣
vt. 开玩笑；逗趣
例句
It isn't always easy to separate the wheat from the chaff.
分清好坏并不总是容易的。
《柯林斯英汉双解大词典》
They grew more and more cheerful, and finally began to chaff each other and insult passengers along the highway.
他们越来越高兴，最后开始在大路上互相逗乐，辱骂行人。
Sift out the wheat from the chaff.
把小麦的壳筛出来。
《新英汉大辞典》
