Observation measures were bone conduction thresholds, changes of ossicular chain, preoperative and postoperative changes of pure-tone hearing.

观察术前骨气导阈值，听骨链改变，手术前后纯音听力改变。

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Remember that hearing a siren or tone alert radio does not mean you should evacuate.

记住，听到警报或人声广播并不意味着你需要撤离。

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But if you say it in an excited tone with a happy face, it's a friendly way of saying you can't believe what you're hearing.

但是你以一种很兴奋的语气，一脸幸福友好的语气，意思是你无法相信自己所听到的。

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The tone of the hearing turned tense before the Apple executives appeared, as Sen.

NPR: Apple's Cook Faces Senate Questions On Taxes

More direct evidence from studies of experiments with animals and humans, however, suggests that we may have to alter the very concept of what we mean by hearing loss, and that current tests - particularly pure-tone audiometry which measures our ability to perform "pin-drop" hearing - may not be sufficient to pick up the early signs of a decline in hearing function.

BBC: Viewpoint: Does deafness contribute to dementia?

The hearing also signaled a shift in tone on the part of Congress, where the new Democratic majority has promised a series of hearings on how the industry markets credit cards to consumers.

NPR: Consumer Groups Seek Cap on Credit Card Fees