The ball is made of rattan — a natural fibre.这个球是由一种天然纤维——省藤制成的。Vintage ports must be decanted to remove natural sediments.上等的波尔图葡萄酒必须倒入其他容器中以滤除自然沉淀物。Mainline feminism was arguing for the inherent beauty of the natural w...
由二苯并-1,3-二氧杂 - 环辛烷 -2- 羧酸经两步反应制得, 总收率70%.It was prepared by the reaction of 12 H - dibenzo [ d , g ] [ 1,3 ] dioxocin - 6 - carboxylic acid with acetoxime....