未知的,不为人知的;
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.
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 went there unbeknown to me.
他瞒着我到那里去的.
He did it unbeknown to me.
他瞒着我干那件事.
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