T-square
绘图用丁字尺 t-square for drawing
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绘图员用铅笔、丁字尺、三角板和比例尺在绘图板上绘图。
Draughtsmen make drawing on a drawing board using a pencil and at-square set square and scale.
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Draughtsmen make drawing on a drawing board, using a pencil and at-square, set square and scale.
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