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)
rad的用法和樣例：
例句
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。
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