由于高速铁路系统，轨道交通彻底改变了。

Rail has completely changed because of the high-speed system.

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我们美国能，也应该有这样的高速铁路系统。

We could; and should have high speed rail service in the United States.

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但是，由于新的高速铁路系统极为复杂，因此有必要进行中期的风险评估。

But the complexity of the new High Speed Train (HST) system is such that a medium-term risk assessment will be necessary.

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