It is said to be most-useful to athletes in endurance sports such as cycling and distance-running.
VOA: special.2011.04.12
He said, first, let it go a little distance, take the distance over time, that gives you the velocity now.
他说,首先,让它运动一小段距离,距离除以时间,你就能得到现在的速度
Now, instead of being the cost of traveling that distance to go and buy the product, what's it going to be?
不是走一定距离,去买产品的成本,它是什么呢
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