Once the call returns for the current time step, you clear the forces applied to the objects from the last step, and then get the current position and Angle of your dynamic body.
一旦此调用针对当前时间步长返回，就可以清空上一步长施加到这些物体上的力，然后获得动态物体的当前方位和角度。
Once one of the two poles in the world, Russia is now considered among the ranks of new rising powers — not a bad group to be in, but clearly a step down from its previous position in global affairs.
曾一度是世界两极中的一极，俄国现在被归为新兴国家行列。 虽然位居此行列也并不差，但比起以前，它在全球事务中的地位明显下降。
Step 2: Summarize the position.
步骤二：给职位做个总结。
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