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。
They were able to measure the speed and direction of vehicles from ground vibrations.
这些节点可以从地面的振动测量出车辆的速度和方向。
Close to the ground, wind speed increases quickly with height.
靠近地面，风速随高度迅速增大。
To define wind speed and direction look at the shadow of a cloud on the ground.
空中风速及风向可由云在空中影子判断。
There was very little of the plane left because it hit the ground at such a high speed.
飞机以如此高速坠毁，因此留下的残骸很少。
There was very little of the plane left because it hit the ground at such a high speed.
飞机以如此高速坠毁，因此留下的残骸很少。
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