Concavities
n. 凹面, 成凹形( concavity的名词复数 )
🗣️ 情景例句
Does that mean that I can see you again?
是不是说我可以再见到你？
A man is known by the company he keeps.
察其友知其人。
Walt invented the steam engine.
瓦特发明了蒸汽机。