effectiveness [əˈfɛktɪvnɪs]

例句:

• Our research attempts to evaluate the effectiveness of the different drugs.
  我们的研究试图对不同药物的疗效进行评估。
  
• The drugs work well at first but gradually lose their effectiveness.
  这些药的效果起初非常好,但后来逐渐失效.
  
• To assert this is to denigrate the effectiveness of the police.
  坚持这一点就是贬低警方的办事能力.
  
• The evidence for the effectiveness of incentives is mixed.
  来自BBC
• Their effectiveness depends on how carefully they're used.
  来自BBC
• Drive sales force effectiveness initiatives to the sales force.
  来自SA