| 释义 |
对流层duìliúcéng大气层的一个层次,接近地面,经常有对流现象发生,层内气温随高度而下降。雨、雪、雹等天气现象发生在这一层。它的厚度在中纬度约10—12公里,在赤道约17—18公里,在两极约8—9公里。{troposphere; inner layer of the atmosphere that is close to earth's surface, within which convection is a common occurrence, the temperature drops with increase in height, and all weather conditions — rain, snow, hail, etc. — manifest themselves. The troposphere varies in height between 10-12 km. above the middle latitudes, 17-18 km. above the equator, and 8-9 km. above the North and South Poles.} |