Afpol
丁二烯苯乙烯橡胶
🗣️ 情景例句
How long does your vacation last?
你的假期有多长？
That's terrible!
真可怕！
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，