For many years the leading fixatives were the animal products ambergris, civet, musk and castoreum.多年来,用的较多的固定剂是动物制品龙涎香 、 香猫香 、 麝香、以及河狸香.Castoreum Fragrance. Fragrances are an inexpensive way to perfume unscented hair pr...
Flavin: Any of a class of organic compounds, pale yellow biological pigments that fluoresce green.黄素: 一组浅黄 、 绿萤光生物色素,在植物和动物组织中分布很广,含量少.FMN ( flavin mononucleotide ) A derivative of riboflavin that is a coenzyme in electr...
He was trying to keep out of the bird's line of sight.他试图躲到那只鸟看不到的地方。Peg down netting over the top to keep out leaves.用销钉在顶上加固防护网，防止叶子落入。She stamped her feet on the pavement to keep out the cold.她在人行道上跺着双脚取暖。...
以正庚醛 、 硫代硫酸钠和溴代正丁烷为原料,合成了正庚醛正丁硫醇缩醛.The heptanal butyl mercaptan was synthesized with heptanal, sodium thiosulfate and 1 bromobutane as raw materials....