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.
英莫尔曼翻转：飞机的一种特技动作，先完成半个环状，然后再完成半个翻滚以获得高度并同时改变飞行方向。
A maneuver in which an airplane first completes half a loop and then half a roll in order to gain altitude and change flight direction simultaneously.
直升机涡环状态边界的确定对直升机飞行安全具有重要意义。
To predict helicopter vortex ring state boundary is necessary for flight safety.
当直升机处于倒飞状态时，必须减少螺距，尽可能使飞行轨迹成为圆形的环状。
As the helicopter is "on its back", the pilot should reduce collective so as to keep the loop as round as possible.
结论哈磁五行针针穴位可减少飞行人员的微循环变异，改善其微循环状态。
Conclusions the acupuncture of Haci five elements needle on acupoint can reduce the variation of microcirculation and improve the microcirculation.
结论哈磁五行针针穴位可减少飞行人员的微循环变异，改善其微循环状态。
Conclusions the acupuncture of Haci five elements needle on acupoint can reduce the variation of microcirculation and improve the microcirculation.
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