population security problems
population security problems
人口安全问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The authors of the latest study indicate that there probably is underreporting in the study because of population movement, inherent errors posed by dealing with samples, and inability to visit some households because of security problems.
CNN: Study: 151,000 Iraqis slain as of June 2006