隱蔽conceal;take cover
活動(dòng)手段多樣、～，很有迷惑性carry out deceptive activities by resorting to different tactics and in disguised forms/公開的和～的活動(dòng)over and covert activities/～發(fā)射陣地concealed firing position/～工作work under cover/～運(yùn)動(dòng)concealed movement（軍）/～真實(shí)身份conceal one’s true identity/～陣地covered position /～得十分巧妙well-concealed;under ingenious concealment |