起初的那篇中说，用户的确切所在位置会被公开，而用户可以选择取消这项服务。
The original stated that members will have their exact whereabouts disclosed and that users can opt out from this service.
接下来，line属性被追加到这个错误消息以便用户能够确切看到在这个XML文件内错误发生的位置。
Next, the line property is appended to the error message so the user can see exactly where in the XML file the error occurred.
对于测试集中的每一个用户，必须给出确切的 3 个 "1" 和 3 个 "0"，否则提交物将被拒绝。
For each user in the test set, exactly three "1"s and three "0"s must be given, otherwise the submission will be rejected.
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