it should be done only once for each mode.

此操作对于每个模式来说只进行一次。

can anything be done about this epidemic of unhappiness?

对于这种忧愁的流行，我们能做些什么吗？

furthermore, something had to be done for the people as well as for the chimps.

而且不光是黑猩猩，我们也必须得为那些可怜的人们做点什么。

and he says it can all be done without adding to the federal budget deficit.

他说，这些完全可以在不增加联邦预算赤字的情况下完成。

but how could this be done without snuffing out the innovation that is the lifeblood of finance?

但是怎样能在不扼杀创新这个金融活力的源泉的情况下做到这些呢？

this can be done on any server of the cluster.

可以在集群的任何服务器中这样做。

i believe - heroes are the people who do what has to be done when it needs to be done, regardless of the consequences.

我相信—英雄就是，不管后果如何，当需要做一件事的时候就勇往直前义无反顾的去做这件事。

some doubt if it can be done - or if it ever should.

有人怀疑它能否做到，或者是否就不应该去做。

douglas: then we’ll work out what needs to be done and who’ll do what.

道格拉斯：然后我们将决定需要做些什么和谁来做这些工作。

each activity represents something that must be done by someone or something.

每个活动表示必须由某人或某物完成的某事。

but how can this be done practically?

但是在实践中如何做到这点呢？

it should be done by the hub or connectors.

这项工作应当由集线器或连接器完成。

some of these exercises can be done alone, but others you have to do with a partner.

其中的一些练习你独自一人就可以完成，而其它的你需要有一个搭档才能完成。