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汉语拼音：chāo shēng

与声具有相同的物理性质但频率高于人耳听力范围的波动现象。

超声 [声音频率高于人耳听觉范围（@@@@@?MHz）时，人们就觉察不出该声音存在之状况。#####]

1. 声音频率高于人耳听觉范围（@@@@@?MHz）时，人们就觉察不出该声音存在之状况。

• I'm going to go way out on a limb and say that it is the most diverting paper ever published in The Journal of Ultrasound in Medicine.

  恕我直言，我觉得这篇文章是《超声医学杂志》有史以来最受争议的文章。

• This may be particularly useful in athletes with a worrying ECG, and yet a "normal" echocardiogram .

  这可能对于那些心电图结果令人担忧而超声心动图结果“正常”的运动员特别有用。

• The toddler, Xia Yingxi, would have to wait a week for an ultrasound test, the mother said, given the large number of children being tested.

  由于大量儿童要接受超声波检查，一位母亲说她刚刚学会走路的女儿，夏颖希，必须等待一个星期才能接该检查。

• The bone-conducted ultrasound has been used in hearing aid since finding out that people are able to perceive it.

  自发现通过骨传导人可以感知超声以来，骨传导超声技术已被应用于助听中。

• Ultrasound has, of course, long been used in medical imaging. It relies on the fact that sound travels faster through denser tissues.

  当然，超声波很早就已用于医疗成像，其应用的依据是声波在密度更大的组织中传播速度更快。

• The innovative ultrasonic technology has been used for years in the research and diagnostics.

  超声波这项新技术被用于研究和诊断领域已经有很多年了。

• Ultrasonic techniques have been used to measure the elastic properties of bone.

  超声波技术已被用来衡量骨的弹性性质。

• Ultrasound is commonly used in medical imaging as a matter wave, and is an important object of research in imaging physics.

  超声是医学影像中常用的一种物质波，是影像物理学中重要的研究对象。

• Under ultrasound, the glass transition temperature of PLA fiber and a crystals has no change. And crystallinity of this fiber rises.

  超声波作用下的聚乳酸纤维，其玻璃化转变温度T_g变化不大，结晶度增大，α晶型没有变化。