Dena
[医][=diethylnitrosamine]二乙基亚硝胺
🗣️ 情景例句
I think the problem can be gotton over without too much difficulty.
我认为问题不难解决。
Count not your chickens before they are hatched.
不要过早乐观。
He did not know from which part of Africa his ancestor had come.
他不知道祖先来自非洲的什么地方。