但是，测量这些物体的速度和距离又是很困难的。
But, again, measuring the speed and distance to these objects is difficult.
把你的iPhone调到自行车伙伴模式以记录你的速度，距离和路程。
Turn your iPhone into a cycling partner that tracks your speed, distance and route.
只有当火车的速度和距离改变了，窗玻璃才静止下来。
Only when the train's speed and pitch changed did the windowpane become silent.
我们必须注意不要把速度和距离混淆起来。
如果已知速度和时间，可以利用一个特别的公式计算距离。
There is a special formula for calculating distance, if speed and time are known.
信息，如速度，距离和时间会自动保存到你的训练日记。
Information such as speed, distance and time are automatically stored to your training diary.
信息，如速度，距离和时间会自动保存到你的训练日记。
Information such as speed, distance and time are automatically stored to your training diary.
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