美国加州大学欧文分校的科学家马库斯•里贝在自己新撰写的文章中介绍说，这种酶可以被进一步修改，届时能转化出比丙烷更长的碳链。
Markus Ribbe, a scientist at the University of California-Irvine, says in a new paper that the enzyme could be further tweaked to make longer carbon chains than those that make up propane.
观察者说碳排放量在2009年经融危机引发的短时下降之后，又再度回升，最终比2008年的最高记录还高出5%。
The watchdog says emissions rose again after a dip caused by the financial crisis in 2009, and ended 5% up from the previous record in 2008.
考古学家在一份声明中说，经放射性碳测年法鉴定，环形巨石阵应该建造于公元前2400年至公元前2200年之间，比之前的推测晚了几百年。
The archaeologists said in the statement that radio-carbon dating put the construction of the circle of bluestones at between 2,400 B.C. and 2,200 B.C., a few centuries later than originally thought.
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