老太太无法隐藏声音中的颤抖，说：“再亲我一下，汤姆！”
The old lady could not hide a tremor in her voice when she said, "Kiss me again, Tom!"
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.
在他粗鲁声音和尖酸刻薄的行为背后隐藏的是一个脆弱的老人。
Duvall is incredible as the old hermit Felix Bush. His gruff voice and mean demeanor hide a vulnerable old man.
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