All the phenomena show: waterflowresistance is the important prerequisite to cause transpiration fluctuation, and the latter can be the result of stomatal oscillation.
这些现象说明，水流阻力是蒸腾波动产生的重要前提条件，而蒸腾波动则可能是气孔开合波动的直接结果。
2
Active water or light oil is sent downhole through hollow rod to reduce oil flowresistance, thus producing heavy oil from deep formation through screw pump.
利用空心杆向井筒内掺入活性水或稀油，降低油流阻力，实现应用螺杆泵开采深层稠油。
3
The keels, finlets, and corselet help direct the flow of water over the body surface in such as way as to reduce resistance (see the figure).