英语释义
1
n a component or accessory added to something after it has been manufactured
2
n the act of adding a component or accessory to something that did not have it when it was manufactured
3
v provide with parts, devices, or equipment not available or in use at the time of the original manufacture
4
v fit in or on an existing structure, such as an older house
5
v substitute new or modernized parts or equipment for older ones