a nine days' wonder
一闪即逝的人或物
A: John seems to be in high cotton. He may well become a big shot.
A：约翰走红起来了，他有可能成为大人物。
B: I bet my bottom dollar that he won't.He's no more than a nine days' wonder.
B：我敢打赌他成不了大人物，他只不过是昙花一现。
A: What's your idea?
A：那你怎么看?
B: Many people like him got a flying start but soon disappeared.
B：很多像他这样的人只是有个开门红，然后便销声匿迹了。