Limonene needed in recycling foamed polystyrene was extracted from the ear of schizonepeta tenuifolia using ligroin.本文研究从荆芥穗中提取回收聚苯乙烯所需的柠檬烯,其方法是溶剂萃取....

ligroin的音标：ligroin的英式发音音标为：['lɪgrəʊɪn]ligroin的美式发音音标为：['lɪgroʊɪn]...

n.轻石油...