未知的,不为人知的;
He went there unbeknown to me.
他瞒着我到那里去的.
His past is ancient and unbeknown just like his true power.
他的过去古老而不为人知,就如同他的真实力量一般.
He did it unbeknown to me.
他瞒着我干那件事.
I am appalled that children can mount up debts unbeknown to their parents.
让我深感震惊的是,孩子们竟会背着父母欠债累累。
He did it unbeknown to us.
他瞒着我们做了那事.
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