add-on

剑桥词典

a piece of equipment that can be connected to a computer to give it an extra use
（電腦）附加設備，附件
A printer is a useful add-on. 打印機是個很有用的電腦附加設備。

an extra part that is added , especially to an officially organized plan , system , agreement , etc.
（尤指正式計劃、制度、協議等的）附加部分，附加項目
Legal expenses cover is often sold as an add-on to household insurance policies . 訴訟費用險經常作爲家庭財産保險的附加險出售。 返回 add-on