Clappet (valve)
[化] 止回阀
🧩 词语组成解析
[建] 止回阀
🗣️ 情景例句
my mother is running for the school board?
我母亲竞选联合校董会董事吗？
We shall never have friends if we expect to find them without fault.
指望朋友无缺点，永远休想交朋友。
Yes, we must.
是的，一定得请。