When we were young, we all probably did such a strange math problem: a big water tank, a pipe drains water in and a pipe drains water out. Only in this way can how keep the water in the water tank full and not overflow? [How can anyone put water into the water tank like this? Isn’t there something wrong with this? ] I always thought so when I was a child. However, when I went to study for the course Pharmacokinetics, I suddenly understood the good intentions of the person who wrote the question. This is a simplified human medication model. Why can’t the medicine be filled at one time? In the above water tank model, the water tank Read More …