bright young thing
noun
- an enthusiastic, ambitious, and self-consciously fashionable young person, a term originally applied in the 1920s to a member of a young fashionable set noted for exuberant and outrageous behaviour热情洋溢、雄心勃勃而又自觉追求时尚的年轻人（原指20世纪20年代行为放纵的英国时髦年轻人）。