有句俗话说，“他们可以吃飞机除外外的一切在天空中飞行的东西，列车除外的一切在地面上运行的东西。”
There is a saying that "they can eat everything flying in the sky except for the planes, and everything running on the ground except for the trains."
万里无云，在这里是指除了划过湛蓝天空的那两三条白色飞机轨迹外，那些轨迹就如同窗格玻璃上的污点痕迹一般。
Cloudless, that is, except for two or three long white lines smeared across the perfect blue sky by airplanes like smudges on a pane of glass.
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