Salts are enriched around electriferous groups of polymer molecules in solution, which formed a salt concentration gradient.

溶液中的盐份富集在聚合物分子的带电基团附近，并形成盐浓度梯度分布。

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Well, you take the gradient of a function.

作出一个函数的梯度。

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Note that this is a radial gradient, whereas earlier you saw a linear gradient.

注意，这是一个放射状渐变，而此前您看到的是一个线性渐变。

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They move from regions of high concentration to regions of low concentration by this natural flow down a concentration gradient.

从高浓度区域,向低浓度区域流动,顺浓度梯度流动

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Movement down a concentration gradient occurs fairly rapidly over short distances like a micron or so, like the size of a bacterium.

顺浓度梯度扩散在一微米左右的短距离内,相当迅速,一微米相当于一个细菌的大小

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The villages we'd be stopping in would all be 7 to 10 miles apart on a path that follows a steady gradient up a single valley, a positively leisurely prospect compared with the up-and-down slogs from one valley to the next that characterize many Himalayan trails.

WSJ: Trekking the Har Ki Doon Trail in India's Himalayas

Mr. Fischer has painted the surface with a faded pale blue hue, a gradient of color he distilled from a landscape photograph using Photoshop, a computer program he employs in much of his work.

WSJ: Urs Fischer's Beds & Problem Paintings Show in Beverly Hills

The defects which plagued the busway included inadequate gradient in a park and ride site prompting fears of flooding and concerns about gaps between the concrete beams allowing them to expand or contract depending on the weather.

BBC: Guided bus wheel