on second thoughts

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We use this expression to say that we have changed our mind about something.

我们用这个说法来表示我们改变了对某事的想法。

A：Do you want to come with us to the park to play football this afternoon?

你今天下午来和我们去公园踢足球吗?

B：No, I'm busy. On second thoughts - yes. The work can wait.

不行，我很忙。我想了一下，还是去吧。工作可以等。

On second thoughts, I might try the fish.

想了一下，还是算了，我还是吃鱼吧。

Can I have a cup of coffee, please? - actually, on second thoughts, I'll have a beer.

请来杯咖啡——说实话，我改主意了，来杯啤酒好了