插入（以扩展功能）的；外挂的able to be added to a computer system so that it can do more things
a plug-in graphics card
插入式图形卡
n.
1.
插件；外挂程式a piece of computer software that can be added to a system so that it can do more things
2.
（连接车库等电源的）发动机预热器接线a connection to an electricity supply in a garage, etc. so that you can use an electric heater to warm the engine of a car, so that it starts more easily