ether
/ˈi:θə(r); `iθɚ/ n[U]
1 colourless liquid made from alcohol, used in industry as a solvent to dissolve fats, etc and (esp formerly) medically as an anaesthetic 醚; 乙醚.
2 (also aether)
(a) (arch or joc 古或谑) the upper air 上空
Today's news goes into the ether and is soon forgotten. 今天的新闻广播听後不久即置於脑後了.
(b) type of substance formerly believed to fill all space through which light waves were thought to travel 以太.