GSM
noun [ S ] trademark uk/ˌdʒiː.esˈem/ us/ˌdʒiː.esˈem/
全球移动通讯系统（global system for mobile communication的缩写）
abbreviation for global system for mobile telecommunications: a technical system for mobile phones used in many countries
The phone company has placed a large order for GSM network equipment. 电话公司下了一个大订单，购买GSM设备。