主动运输（zhudongyunshu）是物质通过质膜进出细胞的方式之一，是质膜上载体蛋白消耗能量而协助物质逆浓度梯度运输的方式。
关闭学校可以作为采取的积极主动措施，目的是减少疾病在校内的传播并减少向更广泛的社区进行扩散。
School closure can operate as a proactive measure, aimed at reducing transmission in the school and spread into the wider community.
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。
Drugs may cross a biologic barrier by passive diffusion, facilitated passive diffusion, active transport, or pinocytosis.
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