Exec runs a command and returns its exit code:
Bren Pierce with Kinisi's KR1 robot, fitted with pincers and suction cups，更多细节参见heLLoword翻译官方下载
，更多细节参见体育直播
https://www.ign.com/articles/2012/06/20/no-upgrade-to-windows-phone-8-for-current-wp7-owners，推荐阅读体育直播获取更多信息
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