that's all I / you / we need! 这个表达并不是如它字面的意思一样，表示正需要某事，实际情况是人们用到了它的讽刺用法。表示我们处境已经很糟糕了，就差某个更糟糕的情况就糟糕透了，这个时候正好这个更糟糕的情况就发生了。于是，就会说That's all I/you/we need! used when something bad has happened to make a situation that is already difficult worse (使情况更糟的坏事发生时说的反话)好，就差那个了!怕什么来什么! And now it's raining - that's all I need! 现在又下雨了——得，就差它了! A: On top of having too many bills to pay, now I have car trouble! 除了有那么多的账单要付之外，现在我还有车子问题！ B: That's just what you need! 怕什么来什么！