pho.to.ac.tiveadj.(形容词)Capable of responding to light photoelectrically.光敏的,光激活的:能以光电形式对光反应的Capable of responding to sunlight or ultraviolet radiation by chemical reaction.能经化学反应感光的:能通过化学反应对阳光或紫外线辐射反应的【引伸】pho.toactiv.ityn.(名词)