Have you actually figured out that rubik's cube again?

你后来解开过那个魔方吗？

How could you never have seen a rubik's cube?

你怎么连魔方都没见过？

Admit it. I'm better at the rubik's cube than you, and I get better grades, and that must be killing you.

承认吧 我魔方比你厉害，成绩比你好 这肯定让你痛不欲生。