The direction of the prevailing wind means that for most of the time the planes must fly over central London.
由于当地盛行风向的关系，飞机在多数时间必须飞跃整个伦敦的中心城区。
Radiation-emitting particles can then travel afar, depending on the speed and direction of the prevailing wind.
放射性微粒形成之后，可以飘到很远的地方，具体多远就看主风的速度和方向。
The northeast-southwest sandy stripes in this image betray the prevailing wind direction, which is generally from the east.
图中东北和西南部的沙丘条纹出卖了当时的风向，通常是东风。
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