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If biofuels do take off,environmentalists and policymakers w

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If biofuels do take off,environmentalists and policymakers will still be unable to relax.Mr Greene emphasises,rightly,that biofuels are"not a silver bullet".
这是一篇讲新型能源的文章,silver bullet有什么特定意思,典故么?怎么融入文章的?详解,
If biofuels do take off,environmentalists and policymakers w
是个短语,silver bullet:something that acts as a magical weapon especially :one that instantly solves a long-standing problem
非常有力的解决方案.
生物燃料并不是“一永劳逸的解决方案”