据辐射专家说，如此之小的剂量，其对个人的危险可以忽略。

The amount is so small that the risk to an individual is negligible, according to radiation experts.

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据美国劳工统计局统计，美国的失业率大概徘徊在百分之十。

According to the U.S. Bureau of Labor Statistics, the nation's unemployment rate is hovering around 10 percent.

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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.

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