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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
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Arc-type fork, security, and will not hurt your baby tone.
圆弧型叉子，安全，不会刺伤宝宝口气。
youdao
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Arc-type fork, security, and will not hurt your baby tone.
圆弧型叉子，安全，不会刺伤宝宝口气。
youdao