It's a big secret, so please keep it under your hat.
那是个秘密，所以请保守秘密。
Here is the deposit book, please keep it well and don't forget the secret code.
这是你的存折，请保存好，不要忘记密码。
请保守秘密。
Please remember your code number and keep it secret.
请记住您的密码，并且保密。
In any case, please keep it a tight secret.
在任何情况下，请保持一个紧密的秘密。
In any case, please keep it a tight secret.
在任何情况下，请保持一个紧密的秘密。
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