We are seated in one of the trains, and with us we have a special speedometer that measures their relative speed.

我们坐在其中的一列火车上带着特制的速度测量仪，可以测出两列火车之间的相对速度。

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we asked. 'Measuring the relative speed and angles of the balls, the distances to the pocket and final placement of the white ball?'

我们问，“测算球的相对速度和角度，判断白球到球袋的距离以及最后的位置呢？

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This exercise gives coaches a good indication of each oarsman’s boat-moving ability—and of the relative speed of combinations of rowers.

通过这个过程，教练可以大体得知船员的划船能力以及和其他组员组合后的相对速度。

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In hedge funds, he sees a growing interest in relative speed.

FORBES: Firms Look to Event Driven Trading for Greater Alpha

Some attribute the drug's popularity to the relative speed with which it is flushed through the body, allowing employees to pass drug tests when they return to work from leave.

BBC: Canada boomtown under pressure

The Peugeot No.9 was leading when the rain started in the 14th hour, offering an opportunity for the Audi cars to make up for their relative lack of speed in dry conditions.

BBC: Le Mans glory for Audi and McNish