的向上或向下流动的市场，在一段时间。
The upward or downward movements of a market, during a period of time.
本文对低压水-空气两相流动在立式螺旋管内向下流动的流型及其转变特性进行了实验和理论研究。
This paper describes an experimental and theoretical research on the two-phase flow pattern transition of downflow in vertical helical coils in an air-water loop.
其次，从女性的社会流动趋势来看，与男性相比，女性向上流动的比例较低，而水平流动和向下流动的比例较高，女性的社会地位有进一步下降的趋势。
Second, compared with men, the percent of women flowing upward in society is lower but that of horizontal and downward mobility is higher, and social standing of women tends to further decline.
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