chapter 281 I'm a serious person.

Ava Chen saw the two pages of draft paper filled with writing and said in surprise: "How long has it been since you did these questions?!"

"It's been almost ten years!"Ethan Mo stretched and said lazily.

This made Ava Chen Xin exclaim: "Ten years?! It's been ten years, and you can still remember these formulas?!"

Let alone ten years, if you don't consolidate these knowledge points repeatedly even in one year, you will probably forget them. If you ask a college student...