evanescent

evanescent
adjective
  1. (chiefly poetic/literary)(主诗/ 文〉)soon passing out of sight, memory, or existence; quickly fading or disappearing
    迅速消失(或消散)的
    a shimmering evanescent bubble.
    闪闪发光但迅速消失的气泡。
    ■(Physics)denoting a field or wave which extends into a region where it cannot propagate and whose amplitude therefore decreases with distance
    (物理)(场,波)渐逝的
派生
evanescence
noun
evanescently
adverb
语源
  1. early 18th cent. (in the sense 'almost imperceptible'): from Latin evanescent- 'disappearing', from the verb evanescere (see evanesce)
英语宝典
考试词汇表