This thesis fills the research gap from the dual-theoretical and empirical research perspective.

本论文从理论和实证研究的双重角度填补研究空白。

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It is pointed out that the geochemistry of tungsten in its effects on environment and health is still a research gap in our country now. Special attention should be paid to this aspect of research.

我国作为世界产钨大国，对钨在生物地球化学和环境化学及其健康影响方面的研究几乎还是空白，亟需尽快开展这方面的数据积累和研究。

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The findings indicate that the research gap between domestic and overseas Chinese scientists has been narrowing in terms of both quantity and quality, though it remains substantial.

结果表明，无论就质量和数量而言，国内外科学家的研究水平仍具有较大差距，但这些差距呈现缩小趋势。

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The findings indicate that the research gap between domestic and overseas Chinese scientists has been narrowing in terms of both quantity and quality, though it remains substantial.

结果表明，无论就质量和数量而言，国内外科学家的研究水平仍具有较大差距，但这些差距呈现缩小趋势。

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