a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
the unit of plane angle adopted under the Systeme International d\\\'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
造句
用作形容詞(adj.)
Have you guys seen Wendy\\\'s new place? It\\\'s so rad. 你們去看過溫迪的新家了沒？太好玩了。