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R
01
半径, 半径
the length of a line segment between the center and circumference of a circle or sphere
02
r, 字母r
the 18th letter of the Roman alphabet
03
伦琴, 辐射单位
a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
04
R（普适常数）, R（气体方程中的常数）
(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
r
01
R级, 未满17岁需家长陪同
describing a motion picture that people under the age of 17 need a guardian or parent in order to watch it
