replacement

他们安装了替换窗户以提高隔热性能。

They installed ___replacement windows to improve insulation.

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.

要找到这样一位技术工人的替代者可不容易。

Finding a ___replacement for such a skilled worker won't be easy.