1. a naturally occurring mixture of a resin and an essential oil; obtained from certain plants. 
   一种天然生成的树脂和香精油的混合物，从某些植物中获取。
2. An oil tube in the fruit of certain plants, such as the carrot or parsley. 
   油道某些植物果实中的油管，如胡萝卜或欧芹
3. Any of various plants of the genus Croton, which includes the sources of cascarilla bark and croton oil. 
   巴豆植物任一种巴豆属植物，包括卡斯卡里拉树皮和巴豆油的最初来源
4. These parts left from dead animals and plants made petroleum, from which petrol and oil are now obtained. 
   这些死去的动植物部分成了石油，汽油和石油制品就是从石油中获取的。
5. Any of certain Old World annual plants of the genus Crambe in the mustard family, cultivated for their seeds, which yield a useful oil similar to rape oil. 
   海甘蓝任一种旧大陆十字花科两节荠属的某些一年生植物，因其种子能榨出类似菜籽油的有用的油而被栽培

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