Quadrinomial
a. 四项式的\\nn. 四项式
🗣️ 情景例句
Anytime.
什么时候都行。
When it started raining, I was reading books.
当开始下雨的时候，我再看书。
It is thought that they arrived more than 30,000 years ago by crossing a land bridge from Asia to America.
他们被认为是在3万多年以前从亚洲跨越一座陆桥来到美洲的。