单词：psa 

名词

• 
  [1.n.psa] (同义词:[prostate_specific_antigen]  [PSA(abbr.Photographic Society of America 美国摄影学会 )]  )
• 
  注释列句：a protein manufactured exclusively by the prostate gland; PSA is produced for the ejaculate where it liquifies the semen and allows sperm cells to swim freely; elevated levels of PSA in blood serum are associated with benign prostatic hyperplasia and prostate cancer
• 上位词 -> [protein( n. [生化]蛋白质 adj. 蛋白质的 )]  [macromolecule( n. 巨大分子, 高分子 )]  [molecule( n. [化]分子, 些微 )]  [unit( n. 个体, (计量)单位, (军队的)部队单位, [数学]最小的整数 )]  [thing( n. 东西, 物, 所有物, 用品, 事, 事情, 事件,事态 )]  [physical_entity]  [entity( n. 实体 )]