在深厚暖云中，垂直速度随时间和高度而变化。
The vertical velocity changes as a function of time and height above ground for the deep warm cloud.
踏跳动作的实质是创造垂直速度的过程。
The takeoff is in essence an action that creates vertical speed.
与高度表，用户就可以知道高度和垂直速度。
With altimeter, users can get to know the altitude and vertical speed.
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