Concaveness
n. 凹面, 成凹形
✅ 同义词
🗣️ 情景例句
Oh, well, I'll probably remember it later.
噢， 也许过一会我会记起来。
He has never been out of China, so he is very excited about liveing abroad.
他以前从未出过国，因此对出国很兴奋。
I hope you are well. Thank you for your last letter.
愿你身体健康。感谢你上次来信。