Lithostratigraphy
n. 岩石层位学
🗣️ 情景例句
I don't think so.
我不这么想。
That's very nice of you. I guess I could use some help.
谢谢你的好意。我想我可能要一点帮助。
The American president who fought for the freedom of slaves in the USA.
为美国奴隶的自由而战的美国总统。