That singer was only a flash in the pan. He disappeared into the air after having made one or two records.
那个歌星也只是昙花一现，出了几张唱片就销声匿迹了。
10.寡不敌众 be outnumbered
The girl was brave enough, but as being outnumbered, she was finally knocked into the middle of next week by the gang.
她很勇敢，但终因寡不敌众，被那帮人打晕过去。