covertadj.隐蔽的；偷偷摸摸的；隐密的n.掩蔽物；树丛；覆羽covert land market无形市场Covert channel mark隐蔽通道标识covert conditioning内隐条件法coverter steel slag转炉钢渣Covert Strike Radar隐蔽进攻雷达covert trade barrier变相贸易壁垒covert reinforcement内隐强化法covert extended time隐性超期covert randomization隐秘的随机化covert sensitization隐蔽性敏感化作用