Those who cannot decipher Feynman diagrams or have never heard of gauge fields (undefined even in the glossary), are advised to bone up beforehand.

• 对于无法识别费曼图表或者对规范场（甚至没有在术语索引中给出定义）一无所知的读者，建议他们要先对预备知识进行一番恶补。