Quadrinomial
a. 四项式的\\nn. 四项式
🗣️ 情景例句
Help! Help! I can't swim!
救命！ 救命！ 我不会游泳
I ask him to tell me everything he thought.
我要求他告诉我，他所想得每件事情。
That's a big box. Is it heavy? Please let me help you.
这是个大盒子。重吗？让我来帮你。