A big fish in a small pond

a big fish in a small pond是指某个小圈子或小组里的杰出人物。

You should move to a smaller company so you can be a big fish in a small pond.

你应该去小点的公司,如此你就是那里的大人物了。

Kettle1 of fish

Kettle of fish可以指你不能不面对的事。

Its a different kettle of fish. Lets talk about it another time.

这是另一回事,大家改日再议。

A fish out of water

A fish out of water是指某人完全不适应环境或不熟知状况。

He doesnt look comfortable in the group at all. He must feel like a fish out of water.

他在这个组里非常不习惯,感觉浑身不自在。

big fish small fish或cold fish

big fish 可以指一位要紧人物。

small fish 的意思则相反。这个习语一般用来形容小人物。

cold fish 是指不太友善且不愿表露情感的人。

I have never had a good relationship with him at all. He seems like a cold fish.

我和他的关系一直都不好,他是个冷漠的人。