n.乙缩醛，乙叉...

ethylidene的音标：ethylidene的英式发音音标为：[ə'θɪlɪdi:n]ethylidene的美式发音音标为：[ə'θɪlɪdin]...

The developments of manufacturing technology and research on ethylidene norbornene abroad were reviewed with 71 references.介绍了国外亚乙基降冰片烯的生产技术和科研工作的进展情况....