gain weight 长胖

lose weight 变瘦

Wow. You look so good. Have you been dieting?

哇你看起来真棒，你最近在节食吗？

Why aren't you eating anything? Are you on a diet or something?

你怎么都不吃的啊？在节食减肥吗？

Is that all you're going to eat?

你就吃这些吗？

Did you already eat?

你这就吃完啦？

I want to lose some weight before summer comes.

我想在夏天到来之前瘦下来。

You look perfect now. You do not need to go on a diet.

你现在这样看起来刚刚好，你没必要减肥。

Losing weight was a terrible struggle.

减肥是一件非常艰难的事。