Some people do gain weight after they stop smoking.

有些人戒烟后的确增加体重了。

People who have inherited a low metabolic rate will gain weight.

因遗传而新陈代谢速度慢的人会发胖。

Gain weight wisely.

明智的增加体重。

I gain weight.

我的体重增加了。

You gain weight during the evaluation process.

你在评估期内体重增加。