... needle etching 针刻 needle file 什锦锉 needle galvanometer 磁针电流计 ...
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etching needle 蚀刻针 ; 刻针
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Sounds are recorded on ordinary records by etching the vibrations of a needle along a spiraling groove.
通过沿着螺旋槽刻划针的振动，声音被记录到传统的唱片上。
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