surreptitiously
adv. 偷偷摸摸地；暗中地
近义词：underground，furtively，secretly，slyly，covertly，stealthily，onthesly，secretively，sneakily，
英英释义
Adverb
- in a surreptitious manner;
"he was watching her surreptitiously as she waited in the hotel lobby"
例句
用作副词(adv.)
- One time, my brother and I surreptitiously made gunpowder.有一次，我和我哥哥偷偷摸摸地制作了火药。