【科学60秒】牙钻声令人恐惧新科技助你克服_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】牙钻声令人恐惧新科技助你克服

听力简介：

[Sound of dentist drill.] That's a sound that inspires fear around the world: the dentists' drill. And fear of that sound itself could play a part in keeping some people from getting their regularly-scheduled check-up. Now, ____1____ this "sound effect" may ____2____. Because researchers in London have developed technology to ____3____ the drill's unpleasant high-pitched whine.
Noise cancelling headphones usually do away with low pitches. So the scientists designed a variation that a dentist could keep on hand. The device fits between any MP3 player or mobile phone and the patient's own headphones. The patients could still hear the dentist or listen to their own music. But the microphone and chip in the device sample the incoming sound and produce an ____4____ wave that ____5____ just the sound of the drill. As the drill's frequency changes, the waveform quickly adapts to maintain the silence.
The researchers have built and tested a prototype. They hope that it could eventually finally provide a ____6____ answer to the question, "Is it safe?"
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