the troposphere
noun[S]
environmentspecializeduk/ˈtrɒp.əs.fɪər/us/ˈtrɑː.pəs.fɪr/thelayerofgasessurroundingtheearthfrom thesurfaceup to aheightof about tenkilometres
（地球的）对流层
Compare
the exosphere
the ionosphere
the mesosphere
the stratosphere
the thermosphere