surreptitiously
秘密地;
暗中;
秘密地顶一下;
偷偷的,暗中的 - 形容韩国人偷拍;
surreptitiously withdrawn funds
抽逃资金;
in the dark in secret on the sly surreptitiously
暗中;
spyware a type of malware that is installed surreptitiously on personal computers to collect information about users
间谍软件;