Pretrochal
前纤毛轮
🗣️ 情景例句
I'd like that.
我很乐意。
Don't just shake you head.
别光摇头，想想办法！
it is quite reasonable to regard the sea floor as the basic form of the crust of the earth,
因此完全有理由把海床看作地壳的基本模壳，