Its radon pollution is low, near to the environment background value.
氡污染水平较低，接近环境本底水平值。
There are different education value orientations exist in different culture background and social environment.
在不同的文化背景与社会环境中，存在着不同的教育价值取向。
There are different education value orientations exist in different culture background and social environment.
在不同的文化背景与社会环境中，存在着不同的教育价值取向。
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