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美国科学家最近开发出了一项新技术,很像中国武侠小说中的“传音入密”。据说,它可以产生一束极为狭窄的声波,使得只有特定的接受者才能听见。这种高度“定向”的声音,听起来就好像来自你的面前,而事实上它很可能是从几百米之外发出来的。美国军方正准
American scientists recently developed a new technology that is very similar to the “transmission of secrets” in Chinese martial arts novels. It is said that it can produce an extremely narrow sound wave so that only certain recipients can hear it. This highly “directed” voice sounds like it comes from your face, but in fact it is likely to be sent from a few hundred meters away. The U.S. military is precisely