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.

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。

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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.

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。

youdao