Let a dog illustrate our point. There are times when a dog sticks its tail up and there are times when it tucks its tail between its legs. Generally, it tucks its tail between its legs when beaten and sticks its tail up when doing fine.

• 好比那个狗，有翘尾巴的时候，有夹尾巴的时候。 大概是打了几棍子的时候它就夹紧尾巴，大概是有了几批成绩的时候它的尾巴就翘起来了。