Concavities
n. 凹面, 成凹形( concavity的名词复数 )
🗣️ 情景例句
Good morning. Would you please bring me some breakfast?
早上好，可否为我送点早餐？
I may be wrong, but your theory is all wrong, professor.
也许我不对，不过，教授您的理论是完全错了。
Yes, I do. I like it a lot. The Chinese people are very friendly.
是的，我非常喜欢，中国人非常友好。