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R
01
半径, 圆半径
the length of a line segment between the center and circumference of a circle or sphere
02
字母R, 字母“R”
the 18th letter of the Roman alphabet
03
放射性单位, 辐射曝光单位
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
气体常数, 理想气体常数
(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
限制级, 18岁以下需陪同
describing a motion picture that people under the age of 17 need a guardian or parent in order to watch it
