The UK-based Royal Commission on Environmental Pollution says that while the materials have so far shown no sign of being harmful, there is a "major gap" in research about their potential risks.
这份报告由英国皇家环境污染委员会完成，它说，尽管纳米材料迄今为止没有表明有害的迹象，但是对其潜在风险的研究还有“严重的欠缺”。
This book fills a major gap in lexicography .
这本书填补了词典学方面的重大缺门。
This book fills a major gap in lexicography .
这本书填补了词典学方面的重大缺门。
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