那不是我的特长用英语怎么说

That is not my field.

I am not good at that .

that's not my cup of tea./i'm not good at that.

I don't have gift on it

I don't have gift on it

那不是我的特长
That's not my strong point
That's is not one of my strong points

举例:
Swimming is not my strong point.
游泳不是我的特长。
Diplomacy is not one of my strong points
外交不是我的特长