N-COUNT A pitchfork is a tool with a long handle and three or four pointed parts that is used on a farm for lifting hay or cut grass. 长柄杈子
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。
When it is struck, a tuning fork produces an almost puretone, 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。
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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