Concaves
(concave 的复数) a. 凹的\\n[医] 凹的, 凹面的
🗣️ 情景例句
What's the difference? No one will ever find out.
有什么两样？没有人会发现。
How long will you be out?
你将出去多久？
Porpoises and sharks are natural enemies.
海豚和鲨鱼是天然仇敌，