We have already completed the first part of the course.

我们已经完成第一部分了。

The perfect progressive aspect is a combination, describing a completed part of a continuous action.

完成进行时则是上述两者的结合，描述一个持续动作中完成的部分。

A milestone is when you have completed an important or significant part of the project.

一个里程碑是当你完成了项目的一个重要或重要的部分。

It is your job to complete these parts.

完成这些部分是你的工作。

20. There's no way he could have completed every part of every project all by himself!

他是绝不可能光靠自己一个人完成每个项目的每一部分的。

By the time of his death he had only completed part of the Old Testament, but others carried on his labours.

到他去世时，他只完成了旧约的一部分，但其他人继续他的工作。