one-trick pony
noun [ C ] uk/ˌwʌn.trɪk ˈpəʊ.ni/ us/ˌwʌn.trɪk ˈpoʊ.ni/
informal仅能做好某一件事的人,只有单一用途的某物
someone or something that is only good for one particular purpose, or at doing one particular thing
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