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.
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: This process is characterized by selectivity and saturability and requires energy expenditure by the cell.
多巴胺通过主动传输过程转运回细胞内后，水平下降。
Dopamine levels wane as dopamine is taken back into cells by an active transport system.
强调了贝类对溶解态重金属的转运除了被动转运之外，还涉及到需要AT P供能的主动转运过程。
It is highlighted that besides passive transport, dissolved metal transport into bivalves was involved in active transport coupled with ATP.
氯化物大多通过近端小管被动吸收，但它在TALH和DCT中主动转运。
Chloride is passively absorbed along most of the proximal tubule but is actively transported in the TALH and the DCT.
对旋转运动柔性梁的时滞主动控制进行实验研究，验证时滞反馈控制的有效性。
In this paper, active control of a rotating flexible beam with time delay is experimentally investigated.
使用时，将安装座固定在多绳金刚石串珠锯的立柱上，启动多绳金刚石串珠锯主电机，带动主动轮做旋转运动。
The mounting seat is fixed on a vertical column of a multi-wire diamond wire saw when in use, and a multi-wire diamond wire saw main motor is started to drive a drive wheel to rotate.
使用时，将安装座固定在多绳金刚石串珠锯的立柱上，启动多绳金刚石串珠锯主电机，带动主动轮做旋转运动。
The mounting seat is fixed on a vertical column of a multi-wire diamond wire saw when in use, and a multi-wire diamond wire saw main motor is started to drive a drive wheel to rotate.
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