我们所用的地表水几乎全由淡水湖和河流供给.Fresh - water lakes and streams furnish nearly all of our surface water supplies.几千年前, 黑海还是个淡水湖.Millennia ago, the Black Sea was a freshwater lake.(?风)于下午三时在船湾淡水湖登陆.It made landfall at Plover Cove re...
我们发现在许多复合材料中正在采用较多量的粉状填料.We find relatively large volumes of particulate fillers being used in many composites.肺血管必须比正常情况下接受更多量的血液.The blood vessels in the lungs have to handle a larger amount of blood than normal.由于这一障碍...