有精油树脂（Oleoresin）、精油（Essential Oil）、水蒸汽蒸馏挥发油 （Steam Volatile Oil）-同精油，又称挥发性油、精油或芳香油。 （1）精油树脂： 天然树脂溶解或混合于精油中。
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方法：用水蒸汽蒸馏法和超临界流体萃取的方法提取挥发油。
METHOD: To extract the volatile oil by steam distillation or supercritical fluid extraction (SFE).
报道了用水蒸汽蒸馏萃取法提取卷柏中挥发性物质，测得卷柏挥发油的含量为2.85%。
Distillation extraction method is used for extracting the volatile constituents of the Herba Selaginellae. The average oil yield obtained is 2.85%.
水蒸汽蒸馏法从显脉香茶菜籽中提取挥发油。
The essential oil from Rabdosia nervosa seeds was extracted by steam distillation.
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