单词：hubble's_parameter 

名词

• 
  [1.n.hubble's_parameter] (同义词:[Hubble's_constant]  [Hubble_constant]  [Hubble's_parameter]  [Hubble_parameter]  )
• 
  注释列句：(cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today
• 上位词 -> [constant( n. [数、物]常数, 恒量 adj. 不变的, 持续的, 坚决的 )]  [number( n. 数, 数字, 数量, 号码, 算术, 诗, 韵律 v. 遍号码, 共计..., 计入, 计算, 算入 )]  [definite_quantity(定量 )]  [measure( n. 尺寸, 量度器, 量度标准, 方法, 测量, 措施 vt. 测量, 测度, 估量, 分派, 权衡, 调节 vi. 量 )]  [abstraction( n. 提取 )]  [entity( n. 实体 )] 
• 所 有 -> [cosmology( n. 宇宙哲学, 宇宙论 )] 
  种 类 -> [cosmology( n. 宇宙哲学, 宇宙论 )]