ev·a·nes·cence /ˌɛvəˈnɛsṇ(t)s/
逐漸消失,容易消失,幻滅
Ev·a·nes·cence n. The act or state of vanishing away; disappearance; as, the evanescence of vapor, of a dream, of earthly plans or hopes.
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evanescence
n : the event of fading and gradually vanishing from sight; "the
evanescence of the morning mist"