作为一个读者，快速的浏览页面上的每一个字，所以我们很少看到一个树，准确并完整地，观察它的树叶，质感，颜色，形状。

Just as a reader skims quickly over the individual words on page, so we scarcely see a tree exactly and completely with regard to its leaves, branches, color, shape.

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云层快速地改变它们形状，就会经常增加出现由一些隆起物，泡芙和缕缕云丝所组合、看起来像一张人面的机会。

That the clouds change shape quickly and frequently increases the chance that some combination of bumps, puffs and wisps will emerge to look like a face.

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在形状重叠非常厉害的拥挤图表上，快速排列形状在其他形状前面显示的顺序，是非常有用的。

On crowded diagrams where shapes overlap, it is also useful to be able to quickly rearrange the order of which shapes appear in front of other shapes.

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