AFTER SOME FURTHER CONVERSATION,I LEDT HIM TO STEAL AWAY___ON HIS ON ACCOUNT.

THERIGH "UNOBSERVED"

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After some further conversation, I let him to steal away ___ on his own account.译文：在进一步作了一些对话之后，我就由着他自行在没被人看见的情况下溜走了。或，在进一步作了一些对话之后，我就由着他自行溜走了，没人看见。译文出来了，我想没必要再解释你的“WHY”的问题了。