That's my weak point.

这正是我的弱点。

Your love is also your weak point.

你的所爱同时也是你的弱点。

But batteries remain the weak point.

但是电瓶还是薄弱环节。

Each of them knew the other's weak point.

他们每个人都知道其他人的弱点。

I know my biggest weak point is of Low Ei.

我知道我自己最大的缺点就是低情智。