求翻译：以核桃青皮为原料，用乙醇进行粗提取，依次用不同极性的石油醚、乙酸乙酯和正丁醇萃取，得到含核桃青皮的次生物质的提取液。是什么意思？

Walnut Peel the raw materials, crude extract with ethanol, followed by use of different polarity petroleum ether, ethyl acetate and n-butanol extraction, secondary substances containing walnut green husk extract.

In walnuts, green leather as a raw material for ethanol rough extraction, and then use a different polarity of petroleum ether, ethyl acetate, n-butanol is derived, is included in the skin of the nocturnal extraction liquid substances.

Take the walnut ilex macropoda as raw material, carries on the thick extraction with the ethyl alcohol, uses the different polar benzine, the ethyl acetate and the normal butyl alcohol extract in turn, obtains including walnut ilex macropoda's secondary material extracting.

Walnut green husk as raw materials, with ethanol crude extracts, in order of different polarities of petroleum ether, ethyl acetate and n-butyl alcohol extraction, are secondary metabolites in extracts of Walnut green husk.

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