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covertly
01
秘密地, 暗中地
with the intention of keeping actions, plans, or operations secret
Example
The intelligence agency operated covertly to gather information on the enemy.
情报机构秘密地进行操作，以收集敌方信息。
The undercover agent observed the criminal activities covertly.
这名 undercover agent 秘密地观察了犯罪活动。
