Palaeotectonics
古地质构造学
🗣️ 情景例句
He was ill at ease with people whom he didn't understand.
他和不熟悉的人在一起感到不自在。
This is a ticket stub.
这是一张票根。
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。