i.on.o.sphere
n.（名词）A region of the earth`s atmosphere where ionization caused by incoming solar radiation affects the transmission of radio waves. It extends from a height of 50 kilometers (30 miles) to 400 kilometers (250 miles) above the surface.电离层：地球大气层的一个区域，该层由于太阳辐射而导致的电离影响无线电波传输。它从距地表50公里(30英里）的高度延伸到距地表400公里(250英里）处
【引伸】
ion.ospher.ic
