Maintenance and Support维护和支持 Modeling and Simulation建模与仿真 materially and substantially (less/greater)重大而深刻的(或更大的) Media & Status媒体和地位 Marketing and Sales市场和销售 Marks and Spencer标志和斯宾塞 Mekeels and Stamps Magazine (philatelic publication)Mekeels和邮票杂志(集邮出版) Material and Services材料和服务 Materials and Structures材料和结构 Methods and Standards方法和标准 McClelland and Stewart Ltd (Canadian book publisher)麦克理兰和斯图尔特有限公司(加拿大的书出版) Mulder and Scully (TV's X-Files characters)莫特和史高丽(电视的x档案字符) Maintenance & Services维护及服务 Modeling and Simulations建模与仿真