evanescent
adj.迅速消失遗忘的，短暂的；生命无常
网络解释.渐消失的；易逝的；短暂；短暂的
mushroom flying slippery momentary fleeting
双语例句
1. 1 . The evanescent post - war economic boom was quickly followed by a deep recession.
大萧条紧随短暂的战后经济繁荣而来.
来自《简明英汉词典》