evanescent
/ˌiːvəˈnesənt/adjective
1- chiefly poetic/literary 〈主诗/文〉soon passing out of sight, memory, or existence; quickly fading or disappearing很快消失（或消散）的：
a shimmering evanescent bubble.
闪闪发光但很快消失的气泡。
1.1
- Physics denoting a field or wave which extends into a region where it cannot propagate and whose amplitude therefore decreases with distance【物理】（波）隐失的, 倏逝的, 衰逝的; （场）瞬逝的, 迅速衰减的。
派生词
evanescence
nounevanescently
adverb词源
early 18th cent. （in the sense 'almost imperceptible'）： from Latin evanescent- 'disappearing', from the verb evanescere （see EVANESCE）.