As outlined in that report, the most severe threat facing any transportation system is a weapon of mass destruction such as a nuclear device or a biological weapon.

正如报告所概括的，所有交通系统面临的最严重威胁，是大规模毁灭性武器，例如核设备或生物武器。

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To demonstrate this, the White House released a report (pdf) today that highlights the economic value of improving the nation's transportation system.

WHITEHOUSE: Share This Post

"Passenger rail service, especially services at higher and high speeds, will require new safety rules, constant public capital investment and operating subsidies, and balance with freight rail service and the rest of the national transportation system -- and currently only some of these elements are in place, " according to a GAO report.

CNN: Is the U.S. turning a corner on high-speed rail?