retrofit

剑桥词典

to provide a machine with a part , or a place with equipment , that it did not originally have when it was built
使（机器）改型翻新，升级改造
A state program to retrofit engines with pollution controls has succeeded in reducing pollution from trains . 州政府对引擎加装污染控制系统的计划成功地降低了火车的污染状况。 返回 retrofit