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1.The free-flow tunnel development is a key technology for the construction of high-speed rail.
自由流动隧道发展是高速铁路建设的关键技术。
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2. The free-flow tunnel development has greatly improved the efficiency of transportation.
自由流动隧道发展大大提高了交通效率。
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3.The free-flow tunnel development is expected to bring significant economic benefits to the region.
预计自由流动隧道发展将为该地区带来显著的经济效益。