inertial [reference] frame， inertial [reference] system
optical reference filter wavelength standard reference material
along coastal region border region
Arid region and semiarid region
Bachu Region of Xin jiang Autonomous Region
Electric power transmission from western region to eastern region
gas conduction from western region to eastern region
infra-black region (blacker than black region)
(thermo) reference material
137Cs reference inventory
3D forward looking reference map
absolute cell reference
absolute reference frame