positive arc正弧positiveadj.积极的；肯定的；明确的；正面的；正数的；阳性的n.正面；正数；正片；[语]原级positive perfectionism积极完美主义positive ground system正极搭铁系统positive meniscus lens正弯月透镜positive externalities正外部性positive value symptom正值症状positive jurisprudence[法] 实在法学positive and aggresive积极进取positive bias junction正偏结positive reinforcement正强化,阳性强化Positive steady states捕食模型