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1.The free-flow tunnel is designed to allow for the efficient flow of goods and materials through the area.
自由流动隧道设计用来使货物和材料能够高效地通过这个区域。
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2. In the free-flow tunnel, the air is constantly moving, providing a comfortable environment for people to walk or exercise.
在自由流动隧道中，空气不断流动，为人们行走或锻炼提供了一个舒适的环境。
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3. The free-flow tunnel is an essential part of the transportation system, ensuring that goods and materials can betransported efficiently and quickly.
自由流动隧道是交通系统的重要组成部分，确保货物和材料能够高效、快速地运输。