它也可以做了，因为他们的梯度绝对没有什么可补充的工作。
It could also do away with the gradients as they add absolutely nothing to the work.
瓦斯的渗透力取决于瓦斯压力梯度，而瓦斯膨胀压力取决于瓦斯绝对压力。
The gas permeation power would be dependent on the gas pressure gradient and the gas expansion pressure would be dependent on the gas absolute pressure.
在边界提取时选取有一定间距的像素分别计算三原色梯度，把其中绝对值最大的梯度作为边界存在的判据之一，同时根据二阶导数符号变化提取边界。
Third, the gradient between two pixels that have certain distance was calculated in three color components respectively, and then the maximum of gradients of the three was attained.
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