Conca
康卡构造, 贝壳状塌陷（构造）； 火口区同心状凹陷
🗣️ 情景例句
Good idea.
好。
I couldn't get through.
我打不通电话。
The life forms most likely to develop on a planet would be bacteria.
行星上最容易生存下来的是细菌。