n.(对某地区的)侦察或观测(尤指为军事目的),(执行侦察任务的)巡逻队、飞行队等,勘探,选点,勘查
A patrol was sent on reconnaissance.
一支巡逻队被派去执行侦察任务.
to make an aerial reconnaissance of the island
对这座岛进行空中侦察
The helicopter was returning from a reconnaissance mission.
直升机完成侦察任务后正在返航。