有很多古汉语的虚词，如“一时齐发，众妙毕备”（《口技》）的“毕”是副词，有“全”的意思，与“原形毕露”的“毕”一样。“相如既归”（《廉颇商相如列传》）与成语“既往不咎”中的“既”都是“已经”。 古代汉语，一词多义相当普遍，其中很大一部分，也保留在成语中，例 There are a lot of words in ancient Chinese, such as “complete in one moment, all in all” (“portability”). “Bi” is an adverb and has the meaning of “full”, which is the same as the “complete” of “original shape”. The “both” is “already” (“Lian Po Shang Xiangru Biography”) and the idiom “in the past,” “both” are “already.” In ancient Chinese, the word polysemy was quite common, and a large part of it was also preserved in idioms.