If an arm is stretched forward under water resistance is increased and a reaction force back ward is developed both of which would contribute to negative acceleration.
如果手臂在水中是向前伸展则阻力会随之增加而向后方的反作用力也会出现，二者都会产生负加速度。
New JS dispersion resistance agent for under water concrete is developed as per the requirement of concrete construction under water.
根据水下混凝土施工的需求研制出一种新型JS水下混凝土抗分散剂。
The hydraulic resistance of shallow water flow under the influence of rainfall has been investigated through the flume experiment with artificial rainfall.
通过实验室人工降雨水槽试验，研究了降雨影响下浅层水流的阻力规律。
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