对于需要沿水平或垂直方向扩展或收缩的简单渐变，这种技术是有效的。

This technique works well for simple gradients that need to expand and contract in a horizontal or vertical direction.

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沿着这条弧线，阿尔法值渐渐变化，一个方向越变越小，而另一方向则越变越大。

Along this arc, the value of alpha changes smoothly, being smaller in one direction and larger in the other.

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从上世纪60年代到70年代，随着赛车车身逐渐变得越来越低，驾驶舱越来越窄，方向盘也变得更小了，这样才能被装到更加紧凑的空间内。

As cars grew progressively lower and cockpits narrower throughout the 1960s and 1970s, steering wheels became smaller, so as to fit into the more compact space available.

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