客机必须曲折地从一个信号站飞到下一个，而不是直线飞行；每一步上升或下降都需要得到地面的许可。
Instead of flying straight, planes must zigzag from one ground beacon to the next, and ascend and descend in steps, at each stage obtaining permission from the ground.
把画面一分为二，在引导观赏者目光流经曲折蜿蜒的起伏山岭后，又进一步把观赏者的视点迫入前景一大片明朗和煦的绿色原野。
The binary structure of the canvas leads the viewers to follow the undulating mountain range, while also being drawn into the bright, wide green field in the foreground.
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