土壤吸收水分的能力减弱使土壤逐渐变得干燥，导致植被进一步减少，从而建立了一个渐进的地表退化循环。

The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation, so that a cycle of progressive surface deterioration is established.

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这里的渐变效果使倒影看起来似乎正在淡出。

The gradient effect here makes the reflection seem to fade away.

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fill() 方法使所有子路径封闭起来，然后逐个填充每个子路径，期间使用 fillStyle （一种颜色，或一个渐变对象）来决定如何绘制填充。

The fill() method closes any subpaths and then fills each subpath in turn using fillStyle (which can be a color, or, as discussed later, a gradient object) to determine how to draw the fill.

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