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。

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Internal speaker produces tuning reference tone.

内置扬声器调整基准音调。

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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。

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Vincenzo wrote a book, startlingly similar in tone and style to the ones his son wrote later, ripping apart ancient Ptolemaic systems of lute tuning, as his son ripped apart Ptolemaic astronomy.

NEWYORKER: Moon Man

Despite a host of tweaks to the rules, tone and cast of the show, Idol felt a lot like the show 25 million-plus viewers have been tuning in to for nearly a decade.

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