Can I lose weight by doing aerobics? 做健身操能减肥吗？

Yes. But I think you'd better diet. 是的。但是我想你最好节食。

It's so difficult for me. 这对我来说太难了。

If you want to lose weight，youd better join a fitness center. 如果你想减肥，最好加入健身巾心。

If you want to lose weight, you'd better join a fitness center. 如果你想减肥，最好加入健身巾心。

I don't think it will be helpful. 我想没什么用处。

It might be as long as you keep it. 如果你坚持，会有帮助的。