one-trick pony

US /wʌn-trɪk ˈpoʊ.ni/
UK /wʌn-trɪk ˈpoʊ.ni/
"one-trick pony" picture
1.

只會一招的馬, 只有一種技能的人

a person or thing that has only one special ability, skill, or area of expertise

:
He's a talented singer, but he's a bit of a one-trick pony, only performing ballads.
他是一位才華橫溢的歌手,但他有點像個只會一招的馬,只唱情歌。
The new software is a one-trick pony; it only does one thing well.
這款新軟體是個只會一招的馬;它只擅長做一件事。