| 单词 | concentration gradient |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔chemotaxis〕The characteristic movement or orientation of an organism or cell along a chemical concentration gradient either toward or away from the chemical stimulus.趋化性：组织或细胞在化学集中上朝向或远离化学刺激的特殊运动或定位作用美国传统〔morphogen〕Any of various chemicals in embryonic tissue that influence the movement and organization of cells during morphogenesis by forming a concentration gradient.构形素，定形素：在形态发生过程中通过形成浓度梯度从而对细胞的运动和组织产生影响的胚胎组织中多种化学品的任何一种美国传统〔pump〕Physiology To transport (ions or molecules) against a concentration gradient by the expenditure of chemically stored energy.【生理学】 输送：通过消耗以化学形式储存的能量把（离子或分子）输送到一个集中倾斜度美国传统 |
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