So far, none of his vertical take-off and landing prototypes has risen much more than a few feet.

目前为止，他的任何一款垂直起降的原型机还没有离地超过几英尺。

youdao

However at current rates, it would take 4, 000 years before the tower is as slanted as the Leaning tower of Pisa which leans by four degrees and is around 12ft off the vertical.

然而，以现行速度来计算，大本钟需要经过4000年才能达到比萨斜塔的倾斜度。比萨斜塔的倾斜度是4度，较其垂直时偏离12英尺(约3.66米)。

youdao

It will have a vertical take-off and landing capability and emergency airframe parachutes, and it will be capable of using various fuels.

它将具有垂直起落能力，并配备有应急机体降落伞，而且它将能够使用多种燃料。

youdao

First, the ducted fan design allows the car to achieve the speed and maneuverability of a helicopter -- 155 mph, 12, 000-foot altitude, two hours of flight time, vertical take off and landing -- but removes the dangers of exposed rotors, allowing the "car" to sidle up to buildings for rescue missions, or coexist in close quarters with other vehicles.

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