🧩 词语组成解析
genus
['dʒi:nəs]
n. （动植物的）属;类;种;型;
🗣️ 情景例句
How long does it take you to get through a letter?
你写一封信要花多少时间？
Oh, I'm very sorry, sir.
噢，我实在抱歉。
For our purposes, we are concerned only with one kind of cost----
就我们的目的而言，我们只关心一种费用-