With the rapid development of subway, it is necessary to consummate the protection for DC traction power supply system.

随着城市地铁的大力发展，研制更加完善的直流保护正是应时之需。

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If I want to travel from place to place in DC, I can use the subway system.

如果在华盛顿我要从一个地方到另一个地方的话，我可以坐地铁。

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The protection and control system in subway DC power supply systems play a key role in ensuring the safety and reliability of the subway.

地铁直流供电的保护与控制系统对确保地铁的安全可靠运行起着关键作用。

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Arlington was a relatively suburban part of the DC metro area until a new underground subway line was put through.

FORBES: Silicon Valley Is Stuck In An Uncanny Valley Of Density

Contestant Number Two is the Metro Police in Washington, DC, which has decided to harass random travelers by searching their bags before they board the subway.

FORBES: Local Government Stupidity Contest