vitiate /ˈvɪʃɪˌeɪt/ ( vitiating, vitiated, vitiates )

• 1. 

  V-T If something is vitiated, its effectiveness is spoiled or weakened. 损害...的效能; 削弱...的效能 [正式]

  例：

  Strategic policy during the War was vitiated because of a sharp division between easterners and westerners.

  由于“东方人”和“西方人”间的巨大分歧，战争期间的战略方针没有得到切实的执行。

  例：

  But this does not vitiate his scholarship.

  但这不会威胁到他的奖学金。