美 [ˈvɪʃieɪtɪd]
v. 损害，削弱；使变质，使效率降低；使失去法律效力；使失效（vitiate 的过去式和过去分词）
vitiate /ˈvɪʃɪˌeɪt/ [ vitiating vitiated vitiates ]
及物动词 If something is vitiated, its effectiveness is spoiled or weakened. 损害...的效能; 削弱...的效能
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。
But this does not vitiate his scholarship.
但这不会威胁到他的奖学金。
impaired by diminution
同义词： diminished / lessened / weakened
损害，弄坏；使无效；污染
失效的
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。
The comic impact is vitiated by obvious haste.
喜剧效果被显然的匆忙削弱了。
The report is vitiated by continual spelling mistakes.
这份报告被不断出现的拼写错误搞糟了。
The benefits of a more disciplined government budget could easily be vitiated by more spendthrift citizens.
The Telecommunicatons Act of two years ago has been vitiated by hyperenergetic regulators and court decisions.
President Reagan repudiated Protocol 1 in 1987 because it vitiated the distinction between lawful and unlawful enemy combatants.