If the liquid level above the pump intake, it is impossible to maximum yield of extraction Wells.

若液面高于泵吸入口，那么井不可能以最大产量开采。

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Distillation extraction method is used for extracting the volatile constituents of the Herba Selaginellae. The average oil yield obtained is 2.85%.

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%。

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Compared with traditional extract method, ultrasound method could improve the extraction yield and save extraction time of paprika red.

与浸提法比较，超声提取极大地缩短了提取时间，而且收率有明显提高。

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