low-frequency

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印度洋和中国南海上空闪电频率增加的区域呈细线状。这是为什么呢？When lightning sparks across the sky, it sends out low-frequency radio waves that researchers can use to determine its location.当闪电划过天空，会释放出低频无

导读:美国一家上诉法院规定，美海军所用声呐违背了海洋法。Sonar approved for use by the US Navy broke marine laws, a US appeals court has ruled.美国一家上诉法院规定，美海军所用声呐违背了海洋法。The low-frequency active sona