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 method has the advantages of simple process flow, low equipment cost and energy consumption, and no wastewater pollution, and is suitable to be popularized and applied in a large area.

本发明具有工艺流程简单，设备成本和能耗低，且没有废水污染的优点，适合大面积推广和应用。

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The preparation method has the advantages of simple preparation flow, low cost, environment friendliness and the like, and is suitable for industrialized application.

本发明具有制备流程简单、成本低、环境友好等优点，适合工业化应用。

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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.

CNN: TARRED BY A BROAD BRUSH

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