First we do practical work and, through it, we gain knowledge.

先有实践，然后有认识。

Let correct ideology guide practical work.

以虚带实。

They starve for the experience of practical work.

他们迫切需要实际工作的经验。

We should apply what we have learned to our practical work.

我们应该把所学的知识应用到实际工作中去。

Let's stop the empty talk and do some useful and practical work.

咱们别空谈了，还是做些有益的实际工作吧。