We can't let him know anything about it. He's too likely to give the game away.我们不能让他知道这事。他太容易泄露秘密了。Don't mention Dad's birthday or you'll give the game away.不要提爸爸的生日，否则就泄露秘密了。Don't let him talk to anybody or he'll give the game away.不要让他和任何人谈话，否则他会泄露秘密的。It's a secret, so don't give the game away, will you?这是个秘密，别告诉别人，好不好？