这些声音可以通过水或地面传播很远，但一些声音人类不可能听到。

These sounds can travel very far through water or the ground, but it is not possible for humans to hear some of the sounds.

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大象在用耳的同时，还能用脚倾听——研究大象超低频鸣叫地面传播的研究人员如是说。

Elephants may be listening with their feet as well as with their ears, say researchers who are studying how well super-low frequency elephant song moves through the ground.

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这些高频声音传播得没有那么远，因此可能更好地隐藏了发出这些声音的个体，它们在自己的地面巢穴中特别容易受到捕食者的攻击。

These higher-frequency sounds do not travel as far, and so may better conceal the individuals producing them, who are especially vulnerable to predators in their ground nests.

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