The middle and lower level of strong acid rain weather is downward motion, inhibiting the spread of pollutants.
强酸雨天气中低层为下沉运动，抑制了污染物的扩散。
The key is absorbing the downward motion and reversing the force into an upward motion as rapidly and smoothly as possible.
要点就是吸收向下的动力，并尽可能迅速平稳地将这个力量转换成向上的动力。
After washing, starting from the bottom, gently brush hair using a downward motion and gradually move up until all of the hair is brushed.
清洗过之后，从底部开始，轻轻地向下梳头发，并且逐渐向上使整个发片都被梳理到。
As it goes up, gravity affects it and slows down (Ease In), then it starts its downward motion more and more rapidly (Ease Out), until it hits the ground.
当他上升时，重力影响它使它变慢(缓入)，然后开始下降时动作就越来越快速(缓出)直到它弹跳到地面。
Air is forced up from the buoy counterweight tube during downward motion causing the balls to seal the air ports in the valve, thus forcing the air to flow into the whistle.
空气在向下运动过程中受到浮标向上的推力，使阀球将阀门里的气舱密封住，这样迫使气流进入雾笛。
Downward motion of the cover towards the base cams the contact beams outward to a specified distance, thus creating a preload situation of the contact beams against the surfaces.
罩朝基座的向下移动使得触头梁向外凸出预定距离，这样产生触头梁抵着表面的预加载位置。
At the same time, there is a considerable downward vertical motion over the oases, which contributes to the transportation of energy and vapor in oases.
同时，绿洲与周围荒漠相比有比较可观的下沟运动，这会对绿洲的能量和水分输送有贡献。
When moving, the tail is carried inclined slightly downward or level with the back, and with a wagging motion.
运动中，尾巴与背部齐平或略低，带有摇摆的动作。
When a drill string moves upward or downward in a well, significant stress variations at the suspension point are caused by the starting and stopping of the motion.
钻柱在上提、下放的开始和终了悬点的应力要发生很大变化，其中以上提过程的终了时变化最大。悬点的应力变化产生速度波和应力波沿钻杆向下传递。
When a drill string moves upward or downward in a well, significant stress variations at the suspension point are caused by the starting and stopping of the motion.
钻柱在上提、下放的开始和终了悬点的应力要发生很大变化，其中以上提过程的终了时变化最大。悬点的应力变化产生速度波和应力波沿钻杆向下传递。
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