noun · the four main compass directions: north, south, east, and west

登高远眺，四维皆是白茫茫的一片。

noun · having or involving four dimensions, especially in mathematics, physics, or geometry

四维空间的概念超出了人类的直观认知。

numeral · the two arms and two legs of the human body, specifically used in traditional Chinese medicine contexts

久病之后，他感到四维无力，步履维艰。

noun · the four cardinal virtues of traditional Chinese ethics: propriety, justice, integrity, and honor (or sense of shame)

礼义廉耻被古人视为“国之四维”。