一周以后，弗莱契对一班新学员讲授高速飞行的原理时在作示范动作。
It happened just a week later. Fletcher was demonstrating the elements of high-speed flying to a class of new students.
一周以后，弗莱契对一班新学员讲授高速飞行的原理时在作示范动作。
It happened just a week later. Fletcher was demonstrating the elements of high-speed flying to a class of new students.
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