为了减轻施工难度，工人们可以用湿粘土或牛的脂肪来润滑道路。
To make the work easier, workers may have lubricated the paths either with wet clay or with the fat from cattle.
雨使道路湿滑，经常导致车祸。
The rain made road slippery, which often resulted in car accidents.
沃尔沃的工程师们设想的汽车将能够在湿滑的道路上彼此警示危险。
Volvo's engineers envision cars being able to warn each other of hazards such as slippery roads.
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