1. The retroreflective material on the road signs helps drivers see them clearly at night.(反光材料在道路标志上帮助驾驶员夜间清晰地看到它们。)
2. The retroreflective clothing worn by the road workers makes them more visible to drivers.(道路工人穿着反光服装,使他们对驾驶员更加可见。)
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