Qīngzhì shíyóu chǎnpǐn de xūqiú suí jīngjì bōdòng.
Demand for light petroleum products fluctuates with the economy.
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usage
Industry term contrasting with 重质石油产品 (zhòngzhì shíyóu chǎnpǐn, heavy petroleum products like fuel oil and asphalt). 'Light' refers to the lower density and shorter hydrocarbon chains, not weight in the everyday sense.
