他在上世纪30年代就取得飞行执照，二战期间还培训过b - 52轰炸机飞行员，70多年来从未坠机，也未在相关事故中受伤。
He has been flying planes since the 1930s and trained B-52 pilots during the World War II. He has never crashed an airplane or been injured by a plane-related incident.
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。
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.
鸟与飞行中的飞机相撞是飞机结构损坏的重要因素，严重时会引发机毁人亡的灾难性事故。
The clash between flying birds and airplanes frequently results in damage of aircraft structures which could even lead to aircraft crash and death of crew members in the most disastrous cases.
鸟与飞行中的飞机相撞是飞机结构损坏的重要因素，严重时会引发机毁人亡的灾难性事故。
The clash between flying birds and airplanes frequently results in damage of aircraft structures which could even lead to aircraft crash and death of crew members in the most disastrous cases.
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