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Hầm cao tốc dài 22,1km xuyên qua dãy Thiên Sơn, công trình Điên rồ nhất của người Trung Quốc
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That looks like the Tianshan Shengli Tunnel on the Urumqi–Yuli Expressway in Xinjiang. At about 22.1 km it is billed as the world’s longest highway tunnel, and its main benefit is cutting the old cross-Tianshan road journey from hours to roughly 20 minutes. The ventilation and winter-maintenance side would be the interesting engineering details.
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