When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time.

音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。

youdao

Musicians had no advantage when it came to pure tone thresholds.

当涉及纯音阈值时音乐家没有优势。

youdao

When it is struck, the tuning fork produce pure tone, retaining its pitch over a long period of.

当敲击音叉的时候，产生几近纯净的音调，能持续好长一段时间。

youdao

Music critics say Jason Mraz sings with a pure and clear tone on the song "Make it Mine."

VOA: special.2010.01.29

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?