reconnaissance
[rɪˈkɑ:nɪsns]
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;
例句:
-
The helicopter was returning from a reconnaissance mission.
直升机完成侦察任务后正在返航。
-
to make an aerial reconnaissance of the island
对这座岛进行空中侦察
-
A patrol was sent on reconnaissance.
一支巡逻队被派去执行侦察任务.
-
The soldiers had been serving with the Formation Reconnaissance Squadron.
来自BBC
-
The rebels say the Iranians were on a reconnaissance mission.
来自VOA
-
Defoe had done his own literary reconnaissance along this coast.
来自W. M. Clarke