藥有陰陽(yáng)配合，子母兄弟。
解釋：藥物之間有陰陽(yáng)、子母、兄弟等配對(duì)關(guān)系，說(shuō)明藥物配伍的原理。
The state is the most important institution in human society because it is the only one that can legitimately use force to maintain order.
Systems have sub-systems and sub-systems have sub- systems and so on ad infinitum - which is why we're always starting over.