昨晚, 我们秘密地举行了一次会议.Last night, we held a meeting in secret.他们已秘密地接过头, 事先曾采取了周密的防范措施.They had had one secret meeting, with elaborate precautions.汽车正在秘密地用卡车运回.The car is being returned by truck, under wraps....

“秘密地”的英语可以翻译为：in private，in secret，[法] behind the scenes，in close confinement，behind closed doors ...