because of mining development
因为矿业的发展
以上为机器翻译结果，长、整句建议使用 人工翻译 。
From long time ago, because of reasons such as high mining cost, there are many limitations for the development of domestic ore mining.
一直以来，我国国产矿石因为开采成本大等原因，其开发一直受到制约。
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