fleeting /ˈfliːtɪŋ/ adjective Learner's definition of FLEETING
[more fleeting; most fleeting]
: not lasting : lasting for only a short time短暂的;闪现的 -
autumn's fleeting beauty短暂的秋日美景
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I caught a fleeting glimpse of the comet.我看见了一闪而过的彗星。
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Her fame was fleeting.她的名气如昙花一现。