For example, two billion years ago (about when the Oklo deposit formed) uranium 235 must have constituted approximately 3 percent, which is roughly the level provided artificially in the enriched uranium used to fuel most nuclear power stations.
For example, two billion years ago (about when the Oklo deposit formed) uranium 235 must have constituted approximately 3 percent, which is roughly the level provided artificially in the enriched uranium used to fuel most nuclear power stations.
例如，20亿年前（大约是欧克陆矿床形成的时候）铀235的比率约为3%，浓度相当于大多数核能发电厂所使用、人工提炼出的高纯度铀。