All the mobile phone must be kept off during the meeting.
开会期间所有的手机必须一律关掉。
The data in this file can be kept for ever even if you exit the program or turn it off .
被保存文件的数据是长期存在的，即使你退出程序或关机。
The data in this file can be kept for ever even if you exit the program or turn it off .
被保存文件的数据是长期存在的，即使你退出程序或关机。
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