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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There are many supporters of the theory of " the two wings " , but this theory is seemingly correct yet wrong.

摘要中国现代文学的“两个翅膀论” ，支持、呼应者颇多，但实际上是一个似是而非的错误理论。

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