reconnaissance
/rɪˈkɒnɪsəns/noun
mass noun
1- military observation of a region to locate an enemy or ascertain strategic features（军事）侦察：
an excellent aircraft for low-level reconnaissance
高性能低空侦察机
as modifier reconnaissance missions侦察任务
count noun after a reconnaissance British forces took the island.一番侦察后, 英国军队占领了该岛。
1.1
- preliminary surveying or research初步调查（或研究）：
conducting client reconnaissance.
进行客户调查。
词源
early 19th cent.: from French, from reconnaître 'recognize' （see RECONNOITRE）.