The reality is that infrastructure software products, such as J2EE application servers, have not yet reached the maturity level of multi-user operating systems.
事实是，基础设施软件产品（如 J2EE 应用服务器）尚未达到多用户操作系统的成熟水平。
Students are also expected to do some system programming on multi-user operating systems such as UNIX or LINUX.
学生也将接触到一些多用户的操作系统程序，例如unix或LINUX。
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