You need to take care of more complicated cases that span more than one table structure on the source by using mapping groups.
你需要关注更多复杂的情形，它们使用映射组来存放更多的表结构。
By using the tickets, visitors may reserve a table in the restaurants, as well as the sing language and baby care services.
参观者还可以使用门票预约餐厅就餐、手语服务、婴幼儿讬管等服务内容。
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