这个玩具是散件的，孩子们喜欢把它组装起来。

The toy comes in pieces, and children enjoy ___putting it ___together.

没有说明书，组装一台复杂的机器并不容易。

It's not easy to ___put a complex machine ___together without instructions.

我们需要把所有部件组装起来以完成项目。

We need to ___put all the components ___together to complete the project.