芙蓉锡矿田中的绿泥石可分为两个矿化阶段。
Chlorite in Furong tin allotment can be divided into two stages of mineralization.
两个矿带成矿作用的差异，主要与所处的区域地质背景不同有关。
The difference of these two belts in mineralization is mainly related to the different regional geological setting.
在锰结核矿勘探和开发上，国际海底管理局已通过了两个法规。
The ISBA has adopted two regulations on the exploration and development of manganese nodules.
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