on second thoughts 

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

我們用這個說法來表示我們改變了對某事的想法。

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

你今天下午來和我們?nèi)ス珗@踢足球嗎？

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

不行，我很忙。我想了一下，還是去吧。工作可以等。

On second thoughts, I might try the fish.

想了一下，還是算了，我還是吃魚吧。

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

請來杯咖啡——說實話，我改主意了，來杯啤酒好了。

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