Effective gatekeeping recognizes that not every product should enter the return flow.

有效的守门认识不是每一种产品都需要进入退货流的。

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Although there are many studies on return flow, but most of them are based on measured data to estimate return flow.

国内外有不少关于回归水的研究，但大都通过实测资料估计。

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The key to the use of this technique lies in selecting appropriate solvents, a certain basicity and time enough for return flow in heating.

使用这种方法的关键在于选择合适的溶剂、足够的碱浓度及加热回流时间。

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These trends suggest the return flow to Mexico surpassed arrivals to the U.S. in 2010 and 2011, the report adds.

WSJ: Mexican Immigration Wave Winds Down

Inside the riser pipe is a space about half a meter in diameter, large enough to hold the spinning drill pipe and bit and to allow the return flow of drilling fluid.

FORBES: The delicate art of sucking up

With the majority of CDOs being backed by mortgages, the principal-only tranche has a known future cash flow, but at a variable rate of return, while the interest-only tranche has both an unknown cash flow and an unknown rate of return on that cash flow.

FORBES: 3 Bonds You May Have Never Heard Of