placer mining [矿业] 砂矿开采 ; 淘选采矿法 ; 砂矿井采
beach placer mining 海滨砂矿开采
beach placer mining industry 海滨砂矿开采业
method of littoral placer mining 滨海砂矿开采法
placer gold mining 砂金矿开采
placer r mining 砂矿淘采
hydraulic mining of placer 砂矿露天水力开采
Placer mining is based on the FACT that heavier substances can be separated from lighter ones in water.
较重的物质可在水中与较轻的物质分离，砂矿开采正是利用这个原理。
This primitive form of placer mining is still used in some places for panning gold.
这种原始的砂矿开采形式至今还在一些地方用来淘金。
I got educated on placer mining, and heard all about the controversy over the use of water cannons.
我得到的教育砂金开采，并听取了所有的争议，使用水炮。
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