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.
人们若为自己的暮年做安排,会使生活有目标.Planning for their old age gives people an aim in life.我们不能为每个紧急需要做安排。We couldn't budget for every emergency.我告诉我的秘书做安排, 她没打电话给你 吗 ?I told my secretary to make the arrangements. Didn't she ...