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.
温迪，你认为没有我的帮助，你能游到或飞到那个岛那么远吗？
Do you think you could swim or fly as far as the island, Wendy, without my help?
他远没有他哥哥那么华而不实。
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