Stay above audible range but don ' t lose them 保持在能听见的范围，但是不要跟丢他们
2.
Animation of audible range of the human ear 动画：人类耳朵的听觉范围
3.
The following diagram shows the audible range of a normal human ear 以下图表显示正常人耳的听觉范围。
4.
The ultrasonic sensor produces a data carrier utilizing very high frequencies that are outside the human ' s audible range 超声波传感器利用高频的声波传输数据，该声波在人的声波范围以外。
