Concaveness
n. 凹面, 成凹形
✅ 同义词
🗣️ 情景例句
I'm surprised they're not here.
我奇怪他们怎么没来。
It's on of his favorite relaxations.
这是他最喜欢的消遣之一。
But if we spend all that money
但是如果我们把所有钱都花光了，