add-on /ˈædˌɑːn/ noun
plural add-ons
plural add-ons
Learner's definition of ADD-ON
[count]
: an extra part or device that can be added to something else to improve it附件；配件 -
He has all the latest add-ons for his computer.他为电脑配上了所有的最新配件
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I knew the base price for the car, but with the add-ons I wanted, the final price was quite a bit higher.我知道这辆汽车的底价，但加上我想要的各种配件以后价格高了很多。
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often used before another noun常用于另一名词前 -
add-on components附属零件
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add-on equipment附加设备