1. having equal strength or efficacy. 
   有相同的实力和功效。
2. a patent medicine whose efficacy is questionable. 
   一种功效需要验证的专利药。
3. reduced in efficacy or vitality or intensity. 
   功效、活力减少或者强度减小。
4. The medicine has no efficacy in the disease. 
   这药对那种病无效。
5. The medicine have no efficacy in the disease. 
   这药对那种病无效。

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