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Spedding and his colleagues think that the unique aerodynamic wake signatures of bat wings are caused by different mechanical operations in the upstroke of the wingbeat.

斯佩丁和他同为，独特气签字后，蝙蝠所造成不同机械操作，在upstrokewingbeat 。

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This movement creates air currents that generate lift from both the upstroke and the downstroke.

这一运动产生了气流，从而在上行和下行时产生升。

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TED-Ed（视频版）

Hummingbirds however, turn their wrists during the upstroke, changing their wing's angle to flap in a figure 8 pattern that continually generates lift throughout their wingbeats.

而，蜂鸟在上击时转动手腕，改变翅膀的角度，以 8 字拍打，在整个拍翅过程中不断产生升。

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