解释：药物之间有阴阳、子母、兄弟等配对关系，说明药物配伍的原理。

I have lived with the prospect of an early death for the last 49 years. I'm not afraid of death, but I'm in no hurry to die. I have so much I want to do first.

We should not only pursue technological leadership but also the practicality and popularity of technology.