名词
中文翻译：浓度梯度
同义词：
['concentration profile', 'concentration gradient profile']
例句：
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1. The concentration gradient of the solution is very steep.
溶液的浓度梯度非常陡峭。
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2. The gradient of the concentration changes with depth.
浓度梯度随着深度的变化而变化。
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3. The concentration gradient is responsible for the movement of water and solutes in the soil.
浓度梯度是土壤中水分和溶质移动的原因。