reveal a secret 泄露秘密；揭露秘密；揭秘；透漏

【例句】
Let me reveal a secret for you: Anyone can learn how to perform magic tricks.
让我向你揭露一个秘密：任何人都可以学习表演魔术。

I want to speak truth through this letter and open my heart and reveal a secret to you.
我希望通过这封信向你坦诚的，开放我的心和揭示我的秘密。