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A stationary object is easy to be aimed at.
一个静止不动的物体是容易瞄准的。
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We know that a stationary object exerts force by virtue of its weight.
我们知道静止物体由自重而产生压力。
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We know that a stationary object exerts force by virtue of its weight.
我们知道静止物体由自重而产生压力。
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