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单词 ionosphere
释义 ionosphere
[ī`an·ǝ´sfir]
GEOPHYSICS
That part of the earth's upper atmosphere which is sufficiently ionized by solar ultraviolet radiation so that the concentration of free electrons affects the propagation of radio waves; its base is at about 40 or 50 miles (70 or 80 kilometers) and it extends to an indefinite height.
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