聚丁二烯经一系列反应转变成丙啶基化合物 ( 聚丁二烯亚胺 ).Polybutadiene is changed to an aziridinyl compound ( polybutadieneimine ) by a series of reactions.丁二烯的衍生物,用于聚合制成氯丁橡胶.A synthetic rubber made from the polymerization of butadiene sodium.利用哈...
很少有鸟类会在镜头面前梳理自己的羽毛。Rare birds preen themselves right in front of your camera.燕雀大约在12个星期大小的时候开始换羽毛。Finches start to moult at around twelve weeks of age.拔羽毛必须干净利落。The feather must be removed with a straight, firm pull....