Lithogeny
岩石成因学
🗣️ 情景例句
I don't know. The baby-sitter says she has a stomachache,
我不知道。临时保姆说她肚子疼.
They are looking forward to the summer vacation.
他们正盼望着暑假的来临。
Sure, Mom. I'll get some at once.
好的，妈妈。我这就去。