英语：英译中In a bookshop an assistant should remain in the background until you have finished browsing.Then,and only then,are his services necessary.不要用翻译器啊，翻译不通的啊。
问题描述：
英语：英译中
In a bookshop an assistant should remain in the background until you have finished browsing.Then,and only then,are his services necessary.
不要用翻译器啊，翻译不通的啊。
答
在一个书店里,卖书的人应该一直呆在旁边等你完成浏览.然后,就只有在那时,他的服务才有必要.
就是说,卖书的人（书店服务人员）不应该打断读者的浏览.