As shown in Table 1, system demonstrations started four to six weeks into the construction phase.
如表1所示，系统演示开始了四到六周时，我们就进入了构建阶段。
2
The manage phase can be categorized into at least four main areas that are more relevant to an SOA system.
管理阶段至少可以分为四个主要领域，它们与SOA系统有更为密切的关系。
3
The reliability and transient stability of the transmission system may be improved, because two adjacent phase conductors of four-phase transmission lines can be operable.