downward venting
... 下向通风器 downward ventilator 向下喷气 downward venting 向下零交越,零上切 downward zero-crossing ...
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当飞机垂直起飞时,飞马发动机前后四个喷管转到垂直向下的位置,在喷气反作用力的作用下产生向上的推力,使飞机垂直上升;
When the plane tries to take off vertically, the Pegasus engine's four jettube will turned to face the ground so that the whiff will raise the aircraft.
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