如果他把闹钟设定在午夜，铃声会把全家人都吵醒。
If he set his alarm clock for midnight, it would wake the whole house.
一首好听的英文歌，短信铃声随便设定！
这个功能对那些有很多联系人，且不想花很长时间挨个设定个性铃声的用户很有用。
This is especially useful for those with very long contact list and don't want to spend hours specifying a ringtone for each.
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