当工作频率大于一定值时，这种变化趋势变得不明显。
The changing trends will become not evidence when the working frequency increases to a certain value.
当流体为液体、流速的值大于0.3 L时，微管道机器人能在管内运动，并且其静止时能从管内流体获得一定的电能。
When the fluid is liquid and its speed is more than 0.3l, the micro piping robot can move in pipe and obtains some electric power when it stops.
当土壤水吸力增大到一定值时，中间土层的土壤非饱和导水率反而大于底土层和表土层。
While the soil water suctions increased to some values, the unsaturated hydraulic conductivities in middle soil layers were higher than those in topsoil layers.
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