First the machine takes off and hovers above the ground by firing downward-facing nozzles.

首先这种机器启动后加热朝下的喷嘴，会在地上盘旋。

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Another variant switches multiple nozzles on or off to achieve a similar result but without the fine control.

另一个交换机的多个变种在喷嘴或关闭，以达到类似的结果，但没有很好的控制。

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The straight blow-off pipe has less blow-off resistance, the flushing area of the swirl nozzles and the fan nozzles is large, the water pressure is high, and the water consumption is less.

直管排污管的排污阻力小，旋 流喷嘴、扇形喷嘴的冲洗面积大、水压高、用水量小。

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The engines would have variable nozzles, which would be fully opened on take-off and landing, so that the exhaust would be slow and relatively quiet, and narrowed when the aircraft was cruising, providing the necessary speed.

ECONOMIST: Green aircraft