a big fish in a small pond
US /ə bɪɡ fɪʃ ɪn ə smɔl pɑnd/
UK /ə bɪɡ fɪʃ ɪn ə smɔl pɑnd/

1.
小池塘里的大鱼, 在小圈子里很重要的人
a person who is important in a small group or organization but who would have much less importance in a larger, more competitive group or organization
:
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He was a big fish in a small pond at his old company, but now he's just one of many at the new multinational corporation.
他在老公司是小池塘里的大鱼,但现在在新跨国公司里只是众多员工中的一员。
•
She prefers to be a big fish in a small pond, where her contributions are highly valued and recognized.
她更喜欢做小池塘里的大鱼,在那里她的贡献受到高度重视和认可。