Mistress Mary put her hand on his arm again without knowing it.

玛丽小姐不知不觉地又把手放在他的胳膊上。

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His most famous example was riding a bicycle: we can do it but without quite knowing how.

他最著名的例举是骑自行车：我们能骑自行车，但不大知道自己是如何做到这一点的。

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Scarlett looked at her father in the fading light, and, without knowing why, she found it comforting to be in his presence.

如今在擦黑的微光中思嘉望着父亲，也不知为什么她觉得一到他面前心里就舒服了。

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Could he possibly have done this on his own without that entire staff knowing about it?

NPR: Client Learns Madoff Returns Worthless

Without knowing it, this man of the industrial revolution spent part of his legacy establishing a center for what would become the Age of Innovation.

NEWYORKER: Get Rich U.

Is it possible that his wife, Debbie, took HGH without Clemens knowing, and that Andy Pettitte, his pious Yankee teammate, lied when he testified under oath that Clemens confided in him about his HGH usage?

CNN: Going after Clemens stupid, political