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单词 θ214509
释义
society > occupation and work > equipment > machine > parts of machines > other parts > [noun] > parts for reducing friction > part of (2)
friction-roller1793

(a) a roller placed so as to lessen the friction of anything passing over it; (b) see quot. 1888.

ball bearing1904

A small, solid metal ball of the kind used in such bearings.

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更新时间:2024/12/24 10:40:20