Chronostratigraphy
年代地层学
🗣️ 情景例句
It's good for every day. It will be good for school, Michelle.
这套衣服每天都可以穿。它适合上学时穿， Michelle。
You must be hungry. Shall we get something to eat?
你一定饿了，我们吃点东西好吗？
We must get help.
我们得找人帮忙。