on a diet造句

He lived on a diet of water and tinned fish.
他仅靠喝水、吃鱼罐头过活。

"He'll have to go on a diet," Ballard quipped.
“他得减肥啦,”巴拉德俏皮地说。

I'm forever on a diet, since I put on weight easily.
我永远都在减肥,因为我很容易长胖。