本文根据饮用水的NO - 3分析资料，阐明了亚硝胺的前体物NO - 3的分布与食管癌的地理分布具有明显的相关性。
The geographical distribution of NO - 3 and esophagus cancer possesses obvious correlation from analytical data for drinking water NO - 3 of samples in this paper.
采用文献资料法、统计分析法、类比法等，探讨了自然地理环境与高原训练间的关系。
Adopting the methods of literature and data, statistical analysis and type comparing, the relationship between geographical conditions and altitude training is studied.
林火地理信息系统（GIS）是一种包含空间资料库管理的地理信息系统，它具有储存，处理，投影转换和取回与显示图形资料的能力；
Geography information system (GIS) is a system which includes the management of interspace data, and it has the abilities of memory, settlement, projection transition and displaying graphs.
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