近20年来人们已经知道,非洲象召唤和回应同伴的声音频率极低,人耳无法听到,而大象之间正是利用这种超低频声波在地下传播而使彼此取得联系。 最近专家们进行了一系列实验,证实在理想条件下,非洲象发出的人耳所听不到的声音能产生一种地震波,可以传到2000米外的地方,而大象的脚 In the past 20 years, it has been known that African elephants evoke and respond to their companions in a very low frequency and cannot be heard by the human ears. It is through the use of this ultra-low-frequency sound waves that the elephants communicate with each other in the ground. Recently, the experts conducted a series of experiments and confirmed that under ideal conditions, the sounds heard by the African elephant’s ear can produce a seismic wave that can be transmitted to places 2,000 meters away, while the elephant’s feet