介词(preposition)

n.abbr:prep. Grammar
In some languages, a word placed before a substantive and indicating the relation of that substantive to a verb, an adjective, or another substantive, as English at, by, in, to, from, and with.
介词在一些语言中放在一实词前，用于表示这一实词与动词、形容词或另一实词的关系，如英语中的 at, by, in, to, from和 with
A word or construction similar in function to a preposition, such as in regard to or concerning.
前置词功能类似于介词的词或结构，如 in regard to 或 concerning