单词：ra 

名词

• 
  [1.n.ra] (同义词:[radium( n. [化]镭 )]  [Ra( 镭(88号元素) [医]风湿病 )]  [atomic_number_88]  )
• 
  注释列句：an intensely radioactive metallic element that occurs in minute amounts in uranium ores
• 上位词 -> [metallic_element]  [chemical_element]  [substance( n. 物质, 实质, 主旨 )]  [matter( n. 事件, 问题, 物质, 内容, 实质, 原因, (印刷或书写的)文件, (文章或讲话等的)素材 vi. 有关系, 要紧 )]  [physical_entity]  [entity( n. 实体 )] 
• 基本总称 -> [uranium_ore] 
  所有总称 -> [uranium_ore] 
  
• 
  [2.n.ra] (同义词:[Ra( 镭(88号元素) [医]风湿病 )]  [Re( [域] Reunion Island, 尼留汪岛(法属) )]  )
• 
  注释列句：ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods
• 实 例 -> [Egyptian_deity] 
  所 有 -> [antiquity( n. 古代, 古老, 古代的遗物 )] 
  种 类 -> [antiquity( n. 古代, 古老, 古代的遗物 )] 
  
• 
  [3.n.ra] (同义词:[right_ascension([天]赤经 )]  [RA( 镭(88号元素) [医]风湿病 )]  [celestial_longitude]  )
• 
  注释列句：(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"
• 上位词 -> [angular_distance(角距离 )]  [angle( n. [数]角, 角落 vi. 钓鱼, 追逐 )]  [space( n. 空间, 间隔, 距离, 空地, 余地, 一段时间 vt. 留间隔, 隔开 )]  [amorphous_shape]  [shape( n. 外形, 形状, 形态, (尤指女子的)体形, 身段, 形式 vt. 制作, 定形, 使成形, 塑造, 使符合 vi. 成形, 形成, 成长 )]  [attribute( n. 属性, 品质, 特征, 加于, 归结于 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 
• 所 有 -> [astronomy( n. 天文学 )] 
  种 类 -> [astronomy( n. 天文学 )]