surreptitiously
(ad.)暗中地
Sur·rep·ti·tious a. Done or made by stealth, or without proper authority; made or introduced fraudulently; clandestine; stealthy; as, a surreptitious passage in an old manuscript; a surreptitious removal of goods. -- Sur*rep*ti*tious*ly, adv.
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surreptitiously
adv : in a surreptitious manner; "he was watching her
surreptitiously as she waited in the hotel lobby" [syn:
sneakily]