The group of scientists said that plants are not as quiet as we had always thought, but in fact their voices are so high-pitched that we just can't hear them.
这群科学家称，植物并不像我们一直以为的那般安静，事实上，它们的声音频率极高，高到我们根本听不到。
Now, this is high-pitched hearing loss, so a person can still hear sounds and understand most speech.
这是一种对高声调的声音听力丧失，所以她/他仍可以听清楚并且明白大多数的日常对话。
So I just nodded and pretended to have a coughing fit, but it was pretty high pitched.
所以我只是点点头，假装咳嗽发作，但声调却很高。
Sheldon: Evolution has made women sensitive to high-pitched noises while they sleep so that they'll be roused by a crying baby.
谢尔顿：人类进化所致，女性在睡眠中对音调高的噪音特别敏感，便于她们被哭闹的婴儿唤醒。
As it flies, it utters a series of cries that are so high-pitched a person cannot hear them.
它飞行时，它发出一连串的叫声，其频率甚高，人类没法听见。
Ralph: She has a nice lilt in her voice, but it's so high-pitched and squeaky . It can really be grating to listen to her for more than a few minutes.
她说话语调轻快，但是声音又尖又短促，听她说话听几分钟就会感到很刺耳。
Ralph: She has a nice lilt in her voice, but it's so high-pitched and squeaky . It can really be grating to listen to her for more than a few minutes.
她说话语调轻快，但是声音又尖又短促，听她说话听几分钟就会感到很刺耳。
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