科学家认为，公共广播系统、扩音器、自动门等利用超声波控制的设备日益增多，可能会导致“超声病”的流行。

Scientists say that a boom in public announcement systems, loudspeakers and automatic doors may be spawning an epidemic of ultrasonic sickness.

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这些与众不同的性质一般都与控制电磁波或声波有关；在这种情况下，电磁波是处于红外波段的。

These unusual properties generally have to do with manipulating electromagnetic (EM) or acoustic waves; in this case, it is EM waves in the infrared spectrum

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多年来，气体标准、烟火使用、激光、超声波、猫头鹰标本和无线电控制的模型飞机，这一切都尝试着将鸟从跑道上吓跑。

Over the years, everything from gas canons, pyrotechnics, lasers, ultrasound, stuffed owls and radio-controlled model aircraft have been tried to scare birds away from runways.

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