A plane flies because air flowing more slowly under its wing exerts more pressure than the faster-moving air flowing above.
飞机之所以能飞翔是因为机翼下方的气流缓慢，对机翼上方的快速流动的空气施加更多的压力。
2
Ms Merkel may yield to pressure from the CDU's liberal wing to make this the centrepiece of her election platform.
默克尔也许会在联盟党自由派的压力下妥协，以此作为她下次竞选纲领的核心措施。
3
Vibrating in the wind, the bristles create some drag. But they also reduce the wing's slipstream, an area of low-pressure turbulence that pulls back on the wing, and hence reduce drag.