这就给了勘探这一代生物燃料的工作一个理由，而这个理由是上一代所缺失的。
This gives the prospects for this generation of biofuels a plausibility that was missing from its predecessors.
还有难以度量但同样深远的问题，那就是整个国家信心的缺失。那萦绕在我们头上的恐惧，认为美国的衰败不可避免，认为我们的下一代人不可能再有太高的期望。
Less measurable but no less profound is a sapping of confidence across our land — a nagging fear that America's decline is inevitable, and that the next generation must lower its sights.
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