trace wheel
... 点线机 roulette 点线轮 trace wheel 点线器 dotting instrument ...
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用点线轮将纸样各线画在另一张纸或对折的纸面上，将对折样板打开或分离开，用铅笔或其它适当工具描画出点线痕迹。
With the line wheel pattern each line drawn on another piece of paper or folded paper, the folded model opened or separated with a pencil or other appropriate tools to draw line traces.
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