游离层 / 游離層

yóu​lí​céng

ionosphere

The region of the upper atmosphere containing a high concentration of free electrons and ions, beginning about 55 kilometers above the earth; it reflects radio waves back to the ground.

游离 (literal) → 游离/遊離 · yóu​lí · free 层 (literal) → 层/層 · céng · layer

Changed: simplified, traditional, gloss, definition, pinyin, variant pinyin, variants, separable parts, decomposition

created sense May 20, 2026, 07:58 PM