... thrust screws & plates 止推螺丝和止推板 tin drain 排锡（放锡） top roll machine 拉边器 ...
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tin drain
锡排水
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Deposits of fine tin too small to mine were allowed to drain into rivers and into the sea.
BBC: Row over Cornwall seabed tin sifting plan
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