Ondulation
. 波浪式振荡, 波动
🗣️ 情景例句
That's fine. I think I can wait till then.
好的，我想我可以等到那时候。
What does the test marketing show?
试销说明了什么？
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，