在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。

In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.

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一眼看去，CSS Ninjas似乎使用的是平直颜色。不过其实每个色彩区域都有微弱的渐变，创造出迷人的材质效果。

CSS Ninjas appears to use flat colors at first glance, but each colored area has a subtle gradient, which gives it texture.

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接下来就是使用了蓝色渐变的内容区（也就是放留言数继续阅读等的区域），这个地方也是导出一个瘦长的区域然后横向重复就能达到其效果。

The lower section of the content panels however use a slight blue gradient, this can simply be exported as a thin strip that will be repeated horizontally.

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