When I turned to look for my father he was gone, and in all the years that have passed no whisper of his fate has come across the borderland of conjecture from the realm of the unknown.

而当我转过头来时，我的父亲已经不见了，这么多年来，关于他的命运没有任何消息，一切都流于未知与猜测。

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The prince waited until her father came, and then he told him that the unknown girl had jumped into the pigeon coop.

王子等在外面不肯离去，一直到她父亲回家时，王子才上前告诉他，说那位他在舞会上遇到的不知道姓名的姑娘藏进了这间鸽子房。

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Her father, for unknown reasons, refused to allow the trip.

不知道出于什么原因，她的父亲拒绝让她出行。

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Hawk, a 31-year-old wholesome-looking father of two, was virtually unknown outside the skateboarding world three years ago.

FORBES: Later, Skater

He is an unknown, callow youth between 28 and 31 years old, promoted to the rank of major-general by his father after some military training in China.

ECONOMIST: Kabila is dead, long live Kabila