单词	主反射
释义	同主反射--一次反射
随便看	principal states of polarization principal station principal station (central station) principal strain principal strain axis principal stress principal stress axis principal stress line principal structure principal sulcus principal sum principal symbol principal synoptic observation principal tangent principal tapping principal tectonic stage principal theory principal thing, principal tide principal tone principal trace principal tract principal tutor to the heir apparent principal tutor to the heir-apparent principal valence