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wash box
Three to four days if you stuck with a pan, he reckoned, but with a portable sluice box you could process the same amount of gravel and material in a single day.
他说，假如你用这样的采金锅需要三到四天，但是如果你有便携式的洗矿槽，淘洗同样数量的矿砂只要一天就够了。
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