旧机器的更换工作提前完成了。

The ___replacement of the old machinery was completed ahead of schedule.

医院批准了更换其所有的磁共振成像扫描仪。

The hospital approved the ___replacement of all its MRI scanners.

费用包括更换门和安装新窗户。

The cost includes the ___replacement of doors and the installation of new windows.