Our speed over the ground was a miserable 2.2 knots.
我们在地面上的速度只有区区的2.2节。
To stay in orbit, an object must be traveling at a constant speed over Earth's surface.
要留在轨道上,一个物体必须以恒定的速度运行于地球表面。
The ports on the front weren't speakers—they were sonar detectors that would calculate a runner's speed, which would then be announced over a pair of headphones.
前面的两个端口并不是扬声器--它们是可以计算跑步这速度的声纳探测器,然后这个速度会在一副耳机上通告出来。
Rapping could be described as speaking or singing words at a fast speed over music with quick beats.
VOA: special.2009.10.14
One way is to say, if I do a full revolution, I think of the speed as a distance over time.
一种方法是,如果我转完整的一圈,我认为速度就是距离除以时间
Whenever you see a particle moving in a circle, even if it's at a constant speed, it has an acceleration, v square over r directed towards the center.
只要看到质点做圆周运动,即使是匀速圆周运动,也存在一个加速度,大小为 v^2 / r,方向指向圆心
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