尽管他一辈子从没摸过画笔，但是突然抑制不住冲动要画出这些情景，而且尽可能画出他的记忆提供的细节。

Yet even though he'd never so much as held a brush in his life, he was suddenly overcome with an urge to paint these scenes, with as much detail as his memory provided him.

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一旦我们得到了云彩的大概区域，要将画笔不透明度调为20%，然后开始慢慢地擦除区域中不需要的细节。

Once we get the general area of our clouds, we want to drop the brush opacity to 20% and start slowly painting away our detailed areas.

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我们把画笔定位于画布上，画笔的中心严格的对应于远处的细节应该在图像上占据的那一点。

We position the brush over the canvas, centering the brush precisely over the point where that distant detail should appear in the image.

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