Concavoconcave
[医] 对凹的, 双凹的
🗣️ 情景例句
watch the last three minutes of the game.
看完那最后三分钟的球赛。
Why aren't you happy?
为什么无聊呢？
Well,they're trying to repair it,sir.
啊，他们正设法修呢，先生。