slyly [slaɪlɪ]

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附加级

adv.狡猾地；偷偷地；俏皮地；会意地

She glanced slyly at Madeleine. 她诡秘地向马德琳瞥了一眼。来自《简明英汉词典》
He was lurking slyly in the background. 他狡猾地躲在背后活动。来自《简明英汉词典》