According to the test data of Changping road, it offers the limitation about porosity of the asphalt surface course on expressway in frigid areas.
以长平高速公路试验数据为依据，提出了寒冷地区高速公路沥青表层的容许空隙率的界限。
China is rich in aromatic plant resources. There are about 400 species, belonging to 62 genera. They are widely distributed in the tropical, subtropical, temperate and frigid areas of our country.
中国香料植物资源丰富，约有分属62科的400余种香料植物，广泛分布于我国热带、亚热带、温带和寒带地区。
Besides being steady and strong, downslope winds can also be cold, and the frigid wind over the ocean surface has helped form fresh sea ice in areas where older ice was blown out to sea.
下行风除了强烈和稳定，还具有低温的特点，这股寒流风吹过海面之后，在那些已形成海冰被吹出海域的地方，新的海冰就形成了。
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