When it is struck, a tuning fork produces an almost pure tone, retaining I.

音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。

youdao

When it is struck, a tuning fork produces an almost pure tone, retaining I.

音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。

youdao