Concavities
n. 凹面, 成凹形( concavity的名词复数 )
🗣️ 情景例句
I'll get you to help serve later.
等一会我会叫你帮忙分菜。
If you run after two hares,you will catch neither.
同时追两兔，一只也难捕。
We stopped in Moscow on the way, but only for an hour or two, so there was no time to go into the centre of the city.
我们在莫斯科停了一下，但只停了一两个小时，所以没有时间去市中心玩。