retrofit
verb- retrofit something
to put a new piece of equipment into a machine that did not have it when it was built; to provide a machine with a new part, etc. 给机器设备装配(新部件);翻新;改型 Voice recorders were retrofitted into planes already in service. 录音设备安在了正在服役的飞机上。 They retrofitted the plane with improved seating. 他们在飞机上安装了经过改良的座椅。
Word Origin1950s: blend of retroactive and refit.