• 1. a long effective: 长期有效的
• 2. a long effective mechanism: 长效机制
• 3. effective for a long time: 长效久安

• 1.Long prison sentences can be a very effective deterrent for offenders.
  判处长期徒刑可对违法者起到强有力的威慑作用。
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• 2.The levo-benzhydryl piperazine derivative is expected to become a long-acting effective medicine.
  左二苯甲基哌嗪有望成为一种长期有效的药物。
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• 3.Most, though, just wanted the tidy resolution of what had long seemed an anachronism, albeit a rather effective one.
  但是大多数议员只是期待妥善解决这个长期存在的时代错误，尽管它是个顽症。
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