in a diet 在 減肥的講法有兩種！但意思不太一樣喔！ be on a ... 的評價 be on a diet / go on a diet 減肥（飲食控制、節食）. 有糖尿病或其他疾病要控制飲食也可以說「I'm on a diet.」 單純節食減肥說「I'm dieting.」就可以了. ... <看更多>
in a diet 在 What is difference between "on a diet" and "in a diet"? 的評價 No doubt, some dictionaries say that you can use these prepositions to refer to a state, but they also say that you use the preposition "on" ... ... <看更多>
