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秘密地, 暗中
with the intention of keeping actions, plans, or operations secret
- The intelligence agency operated covertly to gather information on the enemy.
情报机构秘密行动以收集关于敌人的信息。
- The undercover agent observed the criminal activities covertly.
卧底特工秘密观察了犯罪活动。
- The spy infiltrated the organization covertly to gather crucial information.
间谍秘密潜入该组织以收集关键信息。
- The hacker gained access to the system covertly, leaving no trace.
黑客秘密地获得了系统访问权限，没有留下任何痕迹。
反义词：