The old man wrote a letter to his son and described his predicament.

这位老人写了一封信给他的儿子诉说了这个难处。

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In a letter to his son Humayun, he complains about the obscurity of the young man's vocabulary: "in future write without elaboration; use plain, clear words."

在给他的儿子胡马云的信中，他抱怨年轻人的话很费解：“将来写作时无需花哨，要用平实、清晰的字眼。”

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The old man wrote a letter to his son and mentioned his situation. Dear Son, I am feeling pretty bad because it seems I won't be able to plant my potato garden this year.

老人给儿子写了封信，信中提到了他的处境—— 亲爱的儿子， 我感觉很不好，因为看来今年我不能继续种土豆了。

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The author acknowledged as much in the 1950s in a little-known letter to his son, Michael.

BBC: In Alpine villages, Hobbits lurk

As he was saying goodbye, Derga gave the president a pen, a cheap roller ball he had used to write letter to his son in Iraq.

NPR: Behind Bush's Veto: A Father's Loss, a Humble Pen

Mr Zimmerman's father, Robert Zimmerman, wrote a letter to the Orlando Sentinel denying his son had followed or confronted Martin.

BBC: Rallies held for slain Florida teenager Trayvon Martin