在排水管附近水平流动的假设不成立。
The assumption of horizontal flow in the vicinity of the drains fails.
首先讨论在水平流动时的最低速度，即沉积速度。
We first consider this minimum velocity for horizontal flow, the saltation velocity.
我们对水平流动问题的处理方式，与对垂直流动遵循的方式是同样的。
Our treatment of horizontal flow parallels the treatment we followed for vertical flow.
GPS等测量显示的全球板块运动在一定条件下反映地幔顶部的水平流动。
Under certain conditions, the global plate motions revealed by GPS and other measurements reflect the horizontal flow in the uppermost mantle.
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.
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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