covertadj.隐蔽的;偷偷摸摸的;隐密的n.掩蔽物;树丛;覆羽
covert communication隐秘传输
Covert Viewing System掩蔽物观察系统
covert twill coatings二上二下斜纹阔幅线呢
covert commando force秘密突击队
covert timing channel时间隐通道
covert mandatory plan变相的指令性计划
covert desensitization内隐减敏法
covertly sun-shading隐性遮阳
covert modeling therapy内部示范治疗
covert face recognition内隐面孔再认