Numerical methods were utilized to investigate the time-dependent flow patterns and the frequency characteristics of unsteady tip clearance flow in an axial-flow low-speed isolated compressor rotor.

利用数值方法研究了某低速轴流孤立压气机转子中非定常叶顶间隙流的流动特征和频率特性。

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The researchers pointed out that low-frequency processes, such as fluctuations in stream flow and groundwater levels, would not usually be apparent to human populations.

研究人员指出，低频过程诸如河流流量和地下水水位的波动，通常不会对人类产生明显影响。

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During periods of low demand, jockey pumps are used to meet these lower water flow requirements.

在需求较低的时期，赛马泵用于满足这些较低的水流量要求。

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But the flow of food aid is at a twenty-year low.

VOA: special.2009.09.22

They move from regions of high concentration to regions of low concentration by this natural flow down a concentration gradient.

从高浓度区域,向低浓度区域流动,顺浓度梯度流动

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You might see them on the site and we just keep our operating expenses low so far and by doing that, we've been able to stay cash flow positive for basically the entire existence of the company.

在网站上可以看到,我们一直保持低成本运营，这样可以使得现金流的流入大于流出,自公司创办以来都是这样做的。

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The payoff has been strong cash flow and low debt.

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Wahlstrom says the company meets the requirements for a leveraged buyout or management buyout, chiefly positive free cash flow and low financial leverage, and says it is "more likely than not" that a buyout will happen.

FORBES

As with all the securities in this group, cash flow and relatively low risk are the main attractions.

FORBES: More themes for the coming year