Long range acoustic devices, or LRADs, emit sound waves loud enough to cause pain and permanent damage that could be directed towards the pirates.

长程音波设备(声弹)，简称为LRAD，发出声波的声音足够大以至于可以刺痛人并造成不可弥补的损害，这种设备可以用于阻止海盗。

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Diamond has the highest acoustic velocity, high Young's modulus and excellent mechanical and chemical properties, so have broad application in the field of acoustic devices.

金刚石具有最高的声传播速度和极高的杨氏模量，以及优异的机械和化学性能，在声学方面具有广阔的应用前景。

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To do that, inventors started attaching electronic devices, electrical coils to the acoustic guitars.

为此，发明家们开始在原声吉他上安装电子设备和电子线圈。

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In Washington, a U.S. defense official said the U.S. Navy will contribute two high-tech acoustic devices to listen for emergency beacons still operating in deep water.

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These so-called non-lethal acoustic devices are already in use by U.S. forces in Iraq and some are already in place in areas hit by Hurricane Katrina.

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For example, the task force recommends the creation of a new group to study the use of acoustic switches, devices that can shut off the well via remote control in a disaster.

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