No, thanks. I am on a diet. 不,謝謝。我在節食。
on a diet意思爲吃規定的食物,即節食。
例句:
You're skinny enough without going on a diet!你不必節食就已經夠瘦的了!I'm supposed to go on a diet.我應該節食。He is on a diet to reduce some weight.他正在節食以減輕體重。
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