The composition, major function, operating principle and design idea of SF6 environment monitoring system for high-tension switch house were introduced.

介绍了高压开关配电室SF 6环境监测系统的组成、主要功能、工作原理及设计思想。

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At a hastily arranged press conference at the White House after news of the switch leaked overnight, Obama said the aim was to protect against the threat of an Iranian missile attack.

转变的消息很快被泄露出去，在白宫匆忙安排的新闻发布会上，奥巴马表示此举目的是防止伊朗导弹攻击的威胁。

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Just imagine if changing the light in your room requires you to change the switch also. Would you care to purchase and set up such a system in your house?

想想一下，如果改一下房间里的灯同时需要改开关，你会乐意在你房子上花钱并安装这个系统吗？

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"The attorney general has been asleep at the switch while the White House runs the Justice Department, " he said.

CNN: By Dana Bash/

How -- substantively, how significant is this switch to the White House?

WHITEHOUSE: Press Briefing

Lighthouse authority Trinity House plans to switch off Godrevy light on the edge of St Ives Bay by 2010.

BBC: NEWS | UK | England | Cornwall | Lighthouse switch-off considered