The word **利于 (lìyú)**, meaning "to be beneficial to" or "to be advantageous for," is formed through a standard Chinese morphological process of compounding. It combines the independent character **利 (lì)**, which means "benefit" or "advantage," with the prepositional character **于 (yú)**, which means "to," "for," or "in." Syntactically, **于** functions to introduce the target or recipient of the action, turning the noun "benefit" into a verb phrase meaning "to confer benefit onto." This structure, common in classical Chinese and preserved in modern vocabulary, creates a transitive verb where **利** conveys the core meaning and **于** provides the grammatical direction, resulting in a concise term for expressing utility or favor toward something.