gain weight 发福了，增加体重

If you take in more calories than you are burning then you gain weight.

如果你摄入了比你自身需要更多的卡路里。你就会增加体重。

He has gained weight.

他发福了。

Some people do gain weight after they stop smoking.

有些人戒烟后的确增加体重了。

put on… pounds 胖了……，增重了……

I'm not going to put on pounds over the holidays.

放假期间我一定不要增加体重。

How can she put on 10 pounds in a week?

她怎么能在一周内增加了10磅呢？

She's put on a few pounds this winter.

她今年冬天胖了几磅。