Set preferred number: select a number for each contact which will appear at the top of detailed contact list.
设置首选号码：选择一个号码，每次接触会出现在顶部的详细联络名单。
The transformation also extracts the telephone number with the preferred attribute set to true as shown in Listing 2 .
该转换还提取那些 preferred属性被设置为true的电话号码，如 清单2 所示。
The transformation also extracts the telephone number with the preferred attribute set to true as shown in Listing 2 .
该转换还提取那些 preferred属性被设置为true的电话号码，如 清单2 所示。
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