three r's

n.

读；写；算；基本知识

THREE STEPS TO CLEANER AIR
Somatic hypermutation and the three R's: repair, replication and recombination 1
Montel Williams firmly believes in the three R's
Three-dimensional atmospheric circulation of hot Jupiters on highly eccentric orbits
Three 'Pages' in a chapter of accidents
Chiral three‐dimensional isotropic lattices with negative Poisson's ratio
THREE 'YOKOHAMA-E' WOODBLOCK PRINTS
Method and apparatus for displaying 3D ultrasound data using three modes of operation
Three-dimensional identification of vascular compression in eagle's syndrome using computed tomography: case report
Lincoln's craniofacial microsomia: three-dimensional laser scanning of 2 Lincoln life masks