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after-sales service

noun
🔊/ˌɑːftə ˌseɪlz ˈsɜːvɪs/
🔊/ˌæftər ˌseɪlz ˈsɜːrvɪs/
 [uncountable]
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  1. the fact of providing help to customers after they have bought a product, usually involving doing repairs that are needed or giving advice on how to use the product售后服务Topics Suggestions and advicec1