New words：

diet ['daiət]
n.日常饮食；规定饮食
v.节食；进行规定饮食

go/be on a diet 节食

Sample Sentences：

He is dieting.
The doctor is dieting me strictly.
He is on a diet to reduce some weight.
Patients are taught how to modify their diet.
Proper diet and exercise are both important for health.
I mustn't have too much potato because I'm now on a diet.

modify ['mɔdifai] v.修饰；修改；调整；缓和

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