可再生能源现在满足了国家能源7%的需求，最近几年公共补贴推动了几种替代能源资源的飞跃发展。

Renewable energy now meets 7 percent of the nation's energy needs, and public subsidies have promoted a leap for several alternative energy sources in recent years.

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即使关系数据库缺少解决方案所需的灵活性，与替代技术相比，它们仍然更成熟，更适合满足复杂的业务需求。

Even when relational databases lacked the flexibility required for a solution, they were still more mature and better suited for heavy demands than the alternatives.

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却无法替代研究历史的满足。

But no substitute for actually studying history.

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