Japan and South Korea have joined forces to secure supplies of a rare metal crucial to high-grade steel production, investing $1.8bn in a Brazilian mining group that is the largest producer of niobium.
为了保障对高级钢材生产至关重要的稀有金属铌的供应，日本与韩国已联手对巴西最大的铌生产商投资18亿美元。
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