Undular
a. [物](水躍)波形的
??? 情景例句
First word ...
第一個字……
Let's stop here and continue in about 10 minutes.
我們暫停一下，10分鐘后繼續。
Get him his change! It's easy to say, sir; but look at the bill yourself.
給他找錢！先生，說的倒輕巧，您自己來看看這張票子吧。