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....
约翰逊刮胡子时刮伤了自己。Johnson cut himself shaving.在那桌子的表面上有几条刮伤痕迹.There are several scraping scar marks on the surface of that table.他修剪玫瑰时双手刮伤得很厉害.He scratched his hands badly while pruning the rosebushes....