为了产生抬升力，鸟儿们只要倾斜翅膀，对从身体上方和下方通过的气流稍作调整。
To generate lift, a bird has merely to tilt its wings, adjusting the flow of air below and above them.
“双泡沫”机头部宽大、向下倾斜，导致气流上升获得升力，所以它的尾翼可以更小。
The Double Bubble sports a wide, downward-sloping nose which airflow pushes up, so its tail wings can be much smaller.
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