... 左(右)手划弧 circle left (right) hand 改变劲力方向 change direction of force 眼睛随视双掌 eyes follow both palms ...
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As a result of its change of direction across the blade, the steam will impart a force to the blade.
由于蒸汽通过叶片时改变方向，结果对叶片产生了作用力。
The tail reacts to that change of direction in the primary force (the ball moving), yet it is delayed due to the resistance of momentum.
尾部对主要力（球体运动）的方向变化产生反作用，只是这种作用由于动力的影响而受到了延迟。
The magnitude and direction of force could not change the trend of the stress distribution.
牵引力的大小、方向基本不改变应力的分布趋势。
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