It is difficult to select assessment factors form the complicated eco-environment geology system and assess its quality.
从一个复杂的生态环境地质系统中选取评价因子，进行质量评价是十分困难的。
The research on environment security mainly rested on the stage of qualitative description on environment security or quantitative assessment of natural eco - environment security.
环境安全研究目前主要停留在定性描述或定量评价自然生态安全阶段。
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