Taxi, which is the most active transport mode, has been becoming an important part of the urban public transportation.
出租汽车已经成为城市公共交通的重要组成部分，也是最为活跃的交通方式。
Dopamine levels wane as dopamine is taken back into cells by an active transport system.
多巴胺通过主动传输过程转运回细胞内后，水平下降。
Drugs may cross a biologic barrier by passive diffusion, facilitated passive diffusion, active transport, or pinocytosis.
药物可通过被动扩散、易化被动扩散、主动转运或胞饮作用等方式穿越生物屏障。
Active transport: This process is characterized by selectivity and saturability and requires energy expenditure by the cell.
主动转运这种转运过程的特征是选择性和饱和性，需要细胞的能量消耗。
Active transport The use of energy to move a solute across a membrane against a concentration gradient, a potential gradient, or both (electrochemical potential) . Uphill transport.
主动吸收：亦称代谢吸收。指细胞直接利用能量做功，逆着电化学势梯度吸收离子的过程。
Active transport The use of energy to move a solute across a membrane against a concentration gradient, a potential gradient, or both (electrochemical potential) . Uphill transport.
主动吸收：亦称代谢吸收。指细胞直接利用能量做功，逆着电化学势梯度吸收离子的过程。
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