1、最常见的就是音量没有打开，手机调成振动。很多人调成震动后经常忘记修改回来，而手机放在 枕头 上，振动时声音很小，结果造成没有听到。2、手机扬声器坏了，出现这种情况就需要拿到手机维修店维修了。一般来[详细]
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