add-on
add-on
add-on AHD[²d“¼n”, -ôn”] DJ[6#d7Kn, -7%8n] KK[6#d7$n, -7%n]
n.（名词）
One thing added as a supplement to another, especially a component that increases the capability of the system to which it is added.
附加物，附加装置：作为补充物附加于他物的东西，特指提高所加系统性能的部件
