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。

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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。

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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.

四相线路可以采用两相邻相运行，能提高输电系统运行的可靠性与暂态稳定性。

youdao

As you deploy more capability, interceptor capability and more ships with radars, the ability to protect more and more of Europe will increase with the threat moving from short- to medium-range missiles today to intermediate-range ballistic missiles, and in phase four of our system to intercontinental ballistic missiles by 2020.

WHITEHOUSE: Press Briefing on NATO Defense Capabilities

The solar mission in its first phase focused on areas already connected to the grid and had a pricing system that bundled four units of thermal electricity with one unit of solar-based power, which reduced the average per-unit cost of solar electricity.

WSJ: India Plans Subsidies to Boost Solar-Power Sector