"因"是一个常用汉语词。在先秦文献里,"因"处于虚化过程中,其词性、意义和用法看似十分复杂,但如果明确了"因"的本义为"像垫子(席子)之形"或"会垫子(席子)之意",则该字的各种意义和用法就如网在纲,纲举目张,十分清晰明确了。
As a frequently-used word in Modern Chinese, yin(因) is in the process of grammaticalization in pre-Qin classics and its class, meanings and usages appear very complicated, but a clear understanding that yin's denotation is "like the form of a mat" can shed light on the meanings and usages of this word.