出入细胞的方式有许多种，其中主要分为两大类：质的跨膜运输，细胞的物质输入和输出。
该设备可以在带电离子出入细胞时测量出它们的密集程度。
The device works by measuring the concentration of ions - tiny charged particles - as they enter and exit cells.
当CO被你吸入，它会取代通过红细胞运输出入心脏的氧气。
The CO you inhale takes the place of the oxygen that's carried to and from your heart by your red blood cells.
耐多药(mdr)蛋白最为人知的是有助于癌细胞排出抗癌药物(因而得名)，但是也会输送化合物出入正常的细胞。
Multidrug resistance (MDR) proteins are best known for helping cancer cells expel anticancer drugs - hence their name - but they also ferry compounds in and out of normal cells.
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