noun, verb · a specific branch of industry or a specialized trade

古人常将社会阶层划分为士、农、工、商。

noun, adjective · craftsmanship or technical proficiency in a specific task

这件刺绣作品的工非常精细。

noun · referring to a job, task, or unit of labor, often used in contexts of employment or quantity of work.

他今天找了一份工。