Metro, like Axis2, uses custom additions to the security policy to pass security run-time parameters.

Metro 与 Axis2 一样将自定义内容添加到安全策略来传递运行时参数。

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Taking the Xuanwumen Station work in Beijing metro line 4 as example which is beneath and pass through existing subway station its general situations are introduced.

以北京地铁四号线宣武门车站下穿既有地铁车站工程为例，介绍了其具体工程概况，提出了相应的设计方案。

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