heartfelt ['hɑ:tfelt]

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由衷的（形容詞）

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(adjective) Deeply sincere.

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EXAMPLE: When I learned about the death of my friend's wife, I wrote a letter to him expressing my heartfelt sorrow.

得知朋友妻子去世,，我給他寫了一封信，表達(dá)我由衷的悲痛。

to be not for publication

秘而不宣（成語）

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Idiomatic expression describing something to be kept secret; to not be discussed openly.

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EXAMPLE: I have some important news about the future of our company, but it is not for publication; I don't want you to say anything about it to anyone.

我有一些有關(guān)公司未來的重要消息,，但不能公開,。我不想讓你對任何人說。