Biostratigraphic
a. [古生]生物地层的
🗣️ 情景例句
You and I are very busy these days.
这些天来我们俩都很忙。
I see. Let's break now.
我了解，让我们休息一下吧。
We all know what the poor man should have said,
我们都明白那个可怜的人应该说些什么，