Lithostratigraphic
a. 岩石层位学的
🗣️ 情景例句
But how do you plan to do that?
但你预备怎么做呢？
A word spoken is an arrow let fly.
一言既出，驷马难追。
Is he? I'm sorry to hear that.
是吗？对此我感到遗憾。