Concavoconcave
[医] 对凹的, 双凹的
🗣️ 情景例句
Do you have a cell phone?
你有手机吗？
Continual failure drove him to suicide.
不断的失败逼得他自杀。
It 'flies', therefore, but it cannot fly higher---
这样，船就能飞了，但飞不高。