Spill the Beans: to tell a secret, give something away
泄密：说出一个秘密，说漏嘴

Did you know that Harry was going to buy Sarah a dog ?
你知道吗，哈利打算给莎拉买只狗？

Yes, I did. He was planning on surprising her for their anniversary, but someone spilled the beans.
是的，我知道。他本来计划在他们周年的时候给她一个惊喜，但有人事先泄露了秘密。

What a shame ! That was supposed to have been a surprise.
真可惜！这本来应该是一个惊喜。

Yes, it's too bad that someone told her about the plan beforehand and ruined Harry's surprise.
有人事先告诉她，破坏了哈利的惊喜，真是糟糕。

That's OK. Her enthusiasm was not dampened in the least!
没关系，至少她的热情丝毫没有减少！