美国研究人员称他们已经试验成功用细菌激励来电池，做到自主激励并源源不断地产生氢气。
US researchers say they have demonstrated how cells fuelled by bacteria can be "self-powered" and produce a limitless supply of hydrogen.
2007年美国“次贷危机”的爆发引发了全球性金融危机，使得国内外对经济活动的研究重心回归到房地产业上。
"Sub prime mortgage crisis" in the United state 2007 has triggered the outbreak of the global financial crisis, making the research focus return to the real estate industry.
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