Serial In/Serial Out串行输入／串行输出 Simulation Interoperability Standards Organization模拟互操作性标准组织 Single Input, Single Output单输入单输出 Serial In, Serial Out从串行、系列 Society of Independent Show Organizers (US)社会的独立据(美国) Second In, Second Out (accounting)第二,第二(会计) Soft-Input, Soft-OutputSoft-Input Soft-Output sisomycin西索米星,紫苏霉素 S India Software OperationsS印度软件操作