A reconnaissance or patrol unit that moves ahead of an advance party or guard, or that follows a rear guard.
尖兵在一群前进的士兵或卫兵前面移动的侦察或巡逻的单位, 也指尾随一支殿后的卫队
Photographic aerial reconnaissance especially of military targets.
空中照相侦察空中照相侦察, 尤指军事目的的
The squadron flew a reconnaissance mission.
该空军中队执行一侦察任务.