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1. The city has been working on a plan to upgrade its two-course pavement system.
该市一直在努力升级其双层铺路系统。
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2. The new road is designed with two-course pavement, which makes it safer for pedestrians.
这条新路设计有双层铺路，使行人更安全。
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3. The construction of the two-course pavement has been completed, and the city is now enjoying the improved trafficflow.
双层铺路的建设已经完成，城市现在正享受着交通流量的改善。