A high pitched squeaky noise doesn't do it the force of the highfrequencysound wave does.
像“叽吱”（划玻璃）一样的高音调的噪音就做不到震碎玻璃，而高频率的音波却可以做到。
2
A method where the direction of light passing through a crystal is changed using a highfrequencysound wave.
在那里光的指示过去的一种方法透过一颗晶片被使用高的频率声波改变。
3
They work by sending out pulses of high-frequencysound and then interpreting the reflections as images.To do all this, though, you need a device called a transducer.