然而不可否认，美国货运在过去三十年当中无疑是一场巨大的成功，在本行业里，它是公认的世界之最。

But America's freight railways are one of the unsung transport successes of the past 30 years. They are universally recognised in the industry as the best in the world.

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不可否认，ipad已经是一个百万级的成功产品了。

There's no denying that the iPad has been a mega-hit.

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可否通过测试？成功与否的衡量标准是否明确？

Are the measurements of how success will be determined specific?

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