disappear suddenly and completely 突然不见;消失 Moira vanished without trace. 莫伊拉消失得无影无踪。 ■gradually cease to exist 逐渐消失 the environment is under threat — hedgerows and woodlands are vanishing. 环境正受到威胁,一些灌木与森林在日渐消失。
(Mathematics)become zero (数)变为零
语源
Middle English: shortening of Old French e(s)vaniss-, lengthened stem of e(s)vanir, from Latin evanescere 'die away'