... 螺栓垫圈 facing ring 磨擦锯床 friction saw 送风阻力 fan resistance ...
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friction saw machine 摩擦锯床
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He says they actually use dental floss to slowly saw away at the metal, adding tooth powder to increase the friction.
但是犯人们总能找到办法弄到。现在他们用牙线慢慢钜金属，抹上牙粉增加摩擦力。
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