石油化学工业 shíyóuhuàxuégōngyè petrochemical industry Origin Definitions Defs Strokes Stroke Words Sentences Sents 石油 shíyóu noun petroleum petroleum; oil化学 化學 huàxué noun chemistry; chemical chemistry; chemical; the study of the structure, properties, and reactions of matter工业 工業 gōngyè noun industry industry; manufacturing sector