Quadratic
a. 二次的\\nn. 二次方程式
🗣️ 情景例句
Let's get Marilyn.
还是叫Marilyn来吧。
What shall I send him for his birthday?
我要送他什么东西作为生日礼物？
After that day they were separated, never to see each other again.
那日一别，他们再没重逢。