Planoconcave
[医] 平凹的
🏥 医学释义
现凹的
🗣️ 情景例句
that I wasn't sure.
我说我不能确定。
Never too late to repent.
过则勿惮改。
It was from the study of these that so much was learnt about the interior of the earth.
正是从这两种波的研究中，我们可以了解到地球内部的许多情况。