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。
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。
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