以下为句子列表：
英文: Active transport The transport of molecules or ions across a cell membrane against a concentration gradient, with the expenditure of energy, usually in the form of ATP.
中文: 主动运输：伴随着能量的消耗，ATP的产生，逆着浓度梯度的分子或者离子的跨膜运输。
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英文: Aerotaxis (aerotactic movement) A TAXIS in response to an oxygen concentration gradient.
中文: 趋氧性:一种对氧浓度梯度产生回应的排序。
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英文: Chemotaxis (chemotactic movement) A TXIS in response to a chemical concentration gradient.
中文: 趋化现象：一种对化学浓度梯度的趋化反应。
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英文: Facilitated diffusion A passive transport of molecules across a cell membrane along a concentration gradient, mediated by carrier molecules or complexes, usually proteins.
中文: 易化扩散（促进扩散）：分子沿浓度梯度由载体分子或复合物（通常是蛋白质）作为媒介的一种被动跨膜运输。
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