stratosphere /ˈstrætəˌsfiɚ/ noun Learner's definition of STRATOSPHERE
the stratosphere
1
: the upper layer of the Earth's atmosphere that begins about 7 miles (11 kilometers) above the Earth's surface and ends about 30 miles (50 kilometers) above the Earth's surface平流层(距地表大约11至50千米之间的大气层)
2
: a very high position, level, or amount最上层的;最高档次的