The Chinese word **油田** (yóutián), meaning "oilfield," is formed through a straightforward and logical compound word structure in Mandarin. It combines the character **油** (yóu), which means "oil" or "petroleum," with the character **田** (tián), which means "field" or "farmland." The resulting compound creates a conceptual metaphor, likening a vast, productive area where oil is extracted to an agricultural field, thus efficiently conveying the idea of a geographical region rich in underground oil reserves. This method of word formation, where two independent morphemes are combined to produce a new, transparent meaning, is a fundamental and highly productive feature of the Chinese language.