have other fish to fry [hæv ˈʌðə(r fiʃ tu: frai]

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另有打算，另有事要干

I haven't time to play with the children; I have other fish to fry.我没空和孩子们玩，我还有要事要做。
I'm not going with you,I have other fish to fry.我不和你一起去，我还有别的事。