美国国家自然科学基金会本周一（6月13日）宣布了这一消息。 据估计，这个行星的半径约为地球的两倍。
The discovery of the planet, with an estimated radius about twice that of Earth, was announced Monday at the National Science Foundation.
据美国国家自然科学基金委的“生命之树”项目估计，地球上存在的物种大概有5百万到1亿种，但是，只有2百万种得到确认。
The National science Foundation's "Tree of Life" project estimates that there could be anywhere from 5 million to 100 million species on the planet, but science has only identified about 2 million.
本文首先介绍了美国两大自然科学基金，美国国家自然科学基金会（NSF）和美国能源部（DOE）基金的历史和设置运作情况。
The history and running mode of the two of the most important science foundations in America—NSF and DOE are introduced in this paper.
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