明暗过渡
Light and shade transition
以上为机器翻译结果，长、整句建议使用 人工翻译 。
这是因为当你观察云层的时候，你会发现它是平滑的过渡和尖锐的明暗对比与清晰的明亮的轮廓线两种类型奇怪的混合。
It's because when you take a look at the cloud, you'll find out that its kind of a strange blend of smooth transitions in one hand and sharp contrasts with hard and bright Outlines on the other.
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