The fault modes and system reliability of the flap control system of a certain type of military trainer are studied in the paper.

根据某型教练机襟翼收放系统的具体情况，分析了该系统的可能故障模式，并以襟翼不能放下为顶事件建立了该系统的故障树。

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There's no need to flap—I've got everything under control.

不必担心—一切都已在我控制之中。

《牛津词典》

Because their two sets of wings effectively flap as one, that in theory gives them little control over the aerodynamic forces on their body.

因为它们的两副翅膀叠在一起，在空气动力学的理论中，这意味着它们对自己身体缺乏控制力。

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