break off a bad habit的意思|示意

It is not easy to break off a bad habit.

要改掉一个坏习惯不容易。

I was watching "the Big c" on Showtime the other night, and one of the characters mentioned off-hand that it takes 28 days to break a bad habit.

前几天的一个晚上，我正在看Showtime频道播出的“如果还有明天”，其中一个角色突然提到要改掉一个坏习惯需要28天。

Once you have developed a bad habit, it will be very difficult to break it off.

你一旦养成了坏习惯，改掉它就很难了。