这样的话，必须改，或者戒掉。

In which case, they have to change, or go.

youdao

如果你已经成功地鼓起勇气去戒掉一个坏习惯，或者离开一份没有出路的工作，你就会获得面对其他挑战的信心。

If you've successfully mustered the willpower to kick a bad habit or leave a dead-end job, you gain the confidence to confront other challenges.

youdao

如果你想变瘦，就要少吃饭，喝低度红酒，戒掉啤酒；要对黄油不屑一顾，绝不碰面包——除非是美味的烤面包或者变质的陈面包。

If you wish to grow thinner, diminish your dinner, And take to light claret instead of pale ale;Look down with an utter contempt upon butter, And never touch bread till it's toasted--or stale.

youdao