The test work indicated the probability of a pre-concentration stage using a screening, dense media separation or coarse-ore jigging after crushing and screening.

这个试验工作表明可以通过在进行粉碎和过滤之后对矿石进行再过滤，重阶选矿或者初步汰选的这样一种预浓缩阶段的实现可能性。

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Maybe if Betty had succeeded in removing her at this stage the others might have settled back into their concentration.

假如蓓蒂在这时就能把她拉开，其它人还是能回过神来集中注意力听课的。

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Notice the relatively quick ramp-up of proppant concentration and the large final stage.

请注意相对快速上升的支撑剂浓度和最后阶段。

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The concentration of power among retailers has led to another stage in the shift in power down the food chain.

ECONOMIST: Make it cheaper, and cheaper | The