Based on the conservative condition of vector lines of variable field in the continuous medium, the problems of electromagnetic field in the moving system are discussed in this paper.

本文由连续介质中的可变场的矢量线的保持性条件，主要讨论了运动系统中电磁场的保持性问题。

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The suit must be worn with a dress shirt that can be a solid color or pinstriped. Shirt colors must be conservative, such as white and light or medium blue.

西服一定要搭配衬衫来穿，衬衫可以选择纯色的或细直条纹，一定要选择保守的颜色，比如白色或浅蓝色。

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Syndicated talk radio shows, such as those headed by conservative Rush Limbaugh, have given new life to the medium (radio actually reaches more households today than television).

CNN: Understanding The Role of the Media

The finance secretary also made fresh calls for responsibility for air passenger duty to be devolved to Scotland and for the Conservative-Liberal Democrat coalition at Westminster to do more to improve access to finance for small and medium-sized businesses.

BBC: John Swinney urges benefit reform rethink