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1.after-sale 售后服务
例句：We have some questions about after-sale services.
我们对售后服务有几点疑问。
2.specialize in 专门
例句：Many students specialize in engineering.
许多学生专攻工程学。
3.come under 受到
例句：The police came under attack from angry crowds.
警察遭到愤怒的人群的袭击。
4.a group of 一群
例句：But a group of six women and 23 children got separated from the others.
但是有一群人和其他人走散了，其中有6名妇人和23个孩子。
