brainiac

Everyone says my friend is a brainiac because she always finishes exams in half the time.

大家都说我的朋友是个才智超群的人，因为她总能用一半时间做完考试卷。

You don't have to be a brainiac to use this app; the instructions are very clear.

你不用成为才智超群的人也能使用这个应用，因为说明写得很清楚。

When our team got stuck on the math problem, the brainiac next door came over and helped us.

当我们团队被那道数学题难住时，隔壁那位才智超群的人过来帮了我们。