fleeting

1. ADJ Fleeting is used to describe something which lasts only for a very short time. 短暂的

The girls caught only a fleeting glimpse of the driver. 姑娘们只是匆匆瞥了那个司机一眼。

2. fleetinglyADV 短暂地

A smile passed fleetingly across his face. 笑容从他的脸上一闪即逝。