But deposits large and concentrated enough to be worth mining are indeed rare.
但是,沉积或富集到有开采价值的却实在难找。
Such concentrated deposits ought to make underwater mining highly efficient.
这样的集中式分布可以使水下开采效率大大提高。
Instead, Chinese Banks have focused on buying small stakes in multinationals while resources companies have concentrated on individual mining projects.
中国的银行一直在专注于购买跨国企业少数股权,资源公司则把注意力放在单个矿业项目上。
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