He cautioned that the Russia-American discussions were still in an exploratory stage.
他警告说俄美会谈

探索阶段。
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界 A few private companies, including GSR and Barron's Metals Company, have scooped up a couple of dozen metric tons of the nodules on exploratory missions, and are now pressuring the ISA to approve commercial operations.
包括GSR和Barron 's Metals Company在内的几家私营公司已经在探索任务中收获了几十吨的结核,现在正向ISA施压,要求其批准商业运营。