primary member
... 知结构配件：main structural part 知构件：primary member 枝桠材：branchwood ...
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知结构配件 main structural part
知识构件 Knowledge Component ; b
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它是在公知的人力车传动系统中，原动件改为可作基本线性的往复运动的构件，并采用轮式装置。
The original drive part used in well-known drive system of man driven vehicle becomes basically linear reciprocating structural member and wheel-type unit is used.
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