单词：ft-l 

名词

• 
  [1.n.ft-l] (同义词:[foot-lambert]  [ft-L]  )
• 
  注释列句：a former luminance unit equal to one lumen per square foot
• 上位词 -> [luminance_unit]  [light_unit]  [electromagnetic_unit]  [unit_of_measurement]  [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 )]