结论这种私自开采铀矿已造成了被污染环境生活群体的剂量大大超过天然辐射本底的正常水平，应予以关注。
Conclusion Illegal uranium mining had brought about the fact that the annual effective dose of the inhabitants who lived in contaminated environment was makedly high above the normal level.
然而一个可能的混淆的因素是孩子没有被测试是否在刚学走路时就处在污染环境中。
One possible confounding factor, however, is that the children were not tested for lead exposure when they were toddlers.
哥伦比亚公共交通曾被认为效率低下、不安全且污染环境。
Public transportation in Colombia was traditionally perceived as inefficient, unsafe and polluting.
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