指事物之间相互依存、相互制约的关系。

The consequences of this problem make themselves felt in bookshops. When you go to a large bookshop and look at the self-help sections, as I sometimes do -- if you analyze self-help book sproduced in the world today, there are basically two kinds. The first kind tells you, "You can do it! You can make it! Anything's possible!" The other kind tells you how to cope with what we politely call "low self-esteem," or impolitely call, "feeling very bad about yourself."

【释义】明智的君主反思自己的短处，从而不断完善自己；昏庸的君主掩饰自己的短处，永远处于愚昧无知的状态。