preposition, adverb, verb, numeral · up to a certain point in time or space; to

工作从早至晚。

verb, preposition · to reach a destination or a point in time

嘉宾已至。

adverb · often used in literary or formal contexts to indicate the extent or degree of a situation reaching a certain state.

他当时悲伤过度，几至昏厥。

verb, adverb · indicating the highest degree; extreme or superlative

这篇文章的逻辑至为严密。