evanescent
adj
(fml 文) quickly fading; soon disappearing from memory 迅速消失的; 不久便淡忘的
as evanescent as snowflakes on a river 如雪花落入河中, 瞬即消失
a pop singer's evanescent fame 流行歌曲演唱者一瞬即逝的声誉.
But can we blame those who looked and failed to see what Galileo saw, if we remember that to use a telescope at the limit of its powers calls for long experience and intimate familiarity with one's instrument?