I'm lucky really as I never put on weight.

我真的很幸运 因为我的体重从不增加

I'm forever on a diet, since I put on weight easily.

我一直在节食，因为我的体重很容易增加。

She looks like she's put on weight.

她似乎发胖了。

Men tend to put on weight in middle age.

男人到了中年体重往往会增加。

I'm lucky really as I never put on weight.

我真的很幸运，体重从未增加过。

I can eat what I want but I never put on weight.

我想吃什么就能吃什么，而体重从不增加。