I should be able to do nice bell-shaped curves, but it's harder than it looks standing up here; so that's your bell-shaped curve.

我还是挺擅长画钟型曲线的,但站着画真的不太容易,这就是钟型曲线

耶鲁公开课 - 金融市场课程节选

The math quiz is on calculus, and I am really bad at it.

这次数学考试是关于微积分的，是我特别不擅长的部分。

I'm worried 实战 - SpeakingMax英语口语达人

I'm just like, really bad at math and science.

我只是不擅长数学和科学。

考试考砸了怎么办 - SpeakingMax英语口语达人

I'm not good at remembering names.

我不擅长记人名。

I'm good at 实战 - SpeakingMax英语口语达人