长城是人类历史上最耗时、耗资、耗力的建筑工程，它是人类最伟大的建筑。
The Great Wall is the most timeconsuming, materialconsuming, and laborintensive construction project in human history. It is the ultimate human construction.
工程师们说长城是人类最伟大的工程之一。
Engineers say that the great Wall is one of the greatest works of man.
工程师们说长城是人类最伟大的工程之一。
Engineers say that the great Wall is one of the greatest works of man.
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