用于

用于 is a preposition meaning 'used for' or 'intended for.' It indicates the purpose or function of something, often used in formal or technical contexts.

The character 用 (yòng) means 'to use,' and 于 (yú) is a classical preposition meaning 'in' or 'at,' but in modern usage it often functions as a grammatical particle. Together, 用于 conveys the idea of something being used for a specific purpose.

用于 is commonly found in written Chinese, especially in official documents, technical manuals, and academic texts. It is less frequently used in casual speech, where simpler expressions like 用来 (yòng lái) might be preferred. Understanding 用于 helps learners grasp how to express purpose and function in formal writing.