One way to hold this word: stand on the ground and look up past the clouds. Weather stops somewhere above them, and beyond that is a calm, thin layer of air that begins around ten up. It is far enough away that you will never stand in it, and high enough that reaching it counts as an achievement. Both meanings of the word live at that height — one as real air, one as a way of saying how high a number has gone.
From the word’s history
From French stratosphere, coined by the meteorologist Leon Teisserenc de Bort, from strato- (layer) plus -sphere: the layered shell of air, air that sits in still layers instead of mixing.
來自法文 stratosphère，是氣象學家 Léon Teisserenc de Bort 造的字，由 strato-（層）加 -sphere（圈、球層）組成，字面就是「分層的那一圈空氣」。這條線索正好對上它的性格：這裡的空氣安靜地分層待著，不太上下對流，所以飛機在這裡飛得穩。
Wiktionary entry supplied in this batch's evidence packet (source_ref kaikki:3f6f69a190036ae4:1025079290)
登入就可以看每一支怎麼連回核心畫面。