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1·Plants that were in no immediate danger gave out less than one ultrasonic sound per hour.

那些不受直接威胁的植物每小时发出的超声波不到一次。

2·So if you're standing in front of the ultrasonic sound wave, you can hear the sound.

所以如果你站在超音速声波的前面，你能听到声音。

3·If there is no ultrasonic sound in the received signal, the maximal value is not in order.

而当回波中没有超声信号时，相关值的极大值没有固定规律。

4·There are various ways to measure distance, including ultrasonic sound waves and infrared light.

有各类分歧的办法来丈量间隔，包罗超声波声波和红外光。

5·The application of ultrasonic sound system of measuring distance is also presented in this paper .

给出了超声波语音测距系统在车辆避障中的实际应用。

6·These high intensity ultrasonic sound waves (20 ~ 65khz) are out of the range of hearing of humans are most household pets, but pests.

这些高强度的超声波(20 ~ 65khz)不在人类和大部分家养宠物的听觉范围内，但能被害虫听到。

7·The repetition of the ultrasonic sound and the experiment of zero velocity in gas flowmeter are tested using this speed measurement system.

利用该测速系统，进行了超声波的重复性测试，以及在以空气为介质的零流实验。

8·They can hear ultrasonic sounds from small animals like mice. And they can hear the high sound of whistling something the human ear can't hear.

它们能听见老鼠之类的小动物发出的超声波，并且能听见高频的哨声，那是人类耳朵所听不见的。

9·In this paper, the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.

本文介绍利用超声共振法测量声速和声衰减系数的原理及自来水和乙醇的测量结果。

10·The bat emits these ultrasonic pulses, very high pitch sound waves that we cannot hear.

蝙蝠会发出我们听不到的非常高的超声波脉冲。