Limonene needed in recycling foamed polystyrene was extracted from the ear of schizonepeta tenuifolia using ligroin.
本文荆芥穗中提取回收聚乙烯所需的柠檬烯,其法溶剂萃取。
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By laying low and avoiding competition, stylonurines stuck around millions of years longer, while eurypterines were far more diverse and plentiful at their peak.
通低调和避免竞争,苯乙烯尿素的存时间延长了数百万年,而广翅嘌呤其鼎盛时期更加多样化和丰富。
What throws a spanner in the works is the layer of polyethylene that makes the cup waterproof, and the lid, which is most often made of polystyrene.
工作中投入扳手的子防水的聚乙烯层, 以及通常由聚苯乙烯制成的盖子。
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