We're going to have to buy a new photocopier – this one's done for. 我们得买台新复印机，这一台已经坏了。

If the guards see us, we're done for. 要是卫兵看见我们，我们会没命的。

I'm afraid Oates is pretty well done for – he can't walk any further. 恐怕奥茨已经精疲力竭了，他一步也走不动了。