The signed division will take more time to execute because it rounds towards zero, while a shift rounds towards minus infinity.
有符号的除法要耗费更多的时间，因为除法是使最终结果趋向于零的，而移位则是趋向于负无穷。
We define average velocity as the position at time four seconds minus the position at time zero, 4 divided by four.
我们定义平均速度，是四秒时的位置，减去0秒时的位置，除以。
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