To investigate helicopter vortex-ring state, the phenomenon and reason of helicopter vortex-ring state flight accident is analyzed from the view of helicopter aerodynamics.

针对直升机特有的涡环飞行状态，根据直升机空气动力学理论，分析了直升机涡环状态飞行事故的现象及成因。

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But on a recent surveillance flight over the forest frontier in Brazil's state of para, there was hardly a wisp of smoke in the sky.

但在最近一次在巴西帕拉州雨林边界上空的侦察飞行中，空气中竟然连片缕烟丝都没有。

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In a state of fear the blood rushes to his heart and his limbs to prepare him for flight.

在害怕的状态，血液会迅速流到它的心脏和四肢来使它为决斗做好准备。

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Boarding passes for the flight did not state a departure gate number however, leading to irritation among some passengers lining up at BA's customer service desk to inquire about the status of the flight.

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Flight bans over the state of Bahr al-Ghazal last year led to a rapid deterioration in conditions and an eventual famine.

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That is, until I, in my own sleepy state, accidentally slumped onto the flight attendant call button at my elbow, which chimed loudly and repeatedly.

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