ether
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.