研究人员再将这些纳米金刚石层转换成数十甚至上百的石墨层，象俄罗斯套娃那样一层套在一层里面。

The researchers then transformed those nanodiamonds into dozens or even hundreds of graphene layers, all nestled inside one another like little Russian dolls.

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除了俄罗斯之外，只有德比尔斯公司在海底采矿，它是在纳米比亚和南非海岸开采钻石。

Apart from the Russians, the only company mining the seabed at present is De Beers, which gathers diamonds off the coasts of Namibia and South Africa.

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同纳米索夫先生一样，他也认为俄罗斯急需改变。

Like Mr Nemtsov, he believes Russia urgently needs change.

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