| 单词 | petroleum |
| 释义 | petroleum n. a hydrocarbon oil found in the upper strata of the earth, refined for use as a fuel for heating and in internal-combustion engines, for lighting, dry-cleaning, etc. Phrases and idioms petroleum ether a volatile liquid distilled from petroleum, consisting of a mixture of hydrocarbons. petroleum jelly a translucent solid mixture of hydrocarbons used as a lubricant, ointment, etc. Etymology: med.L f. L petra rock f. Gk + L oleum oil |
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