随着天然砂石资源的逐渐短缺，国家制定了一系列政策法规来限制天然砂石的开采。
As natural sandstone resources shortage, countries gradually has formulated a series of policies and regulations to limit natural sand mining.
随着天然砂石资源的逐渐短缺，国家制定了一系列政策法规来限制天然砂石的开采。
As natural sandstone resources shortage, countries gradually has formulated a series of policies and regulations to limit natural sand mining.
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