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It is believed that such a level is of no significance to human health having regard to natural background levels. 令人信服的是，考慮到自然本底值，這樣小的放射水平對人體健康是無關緊要的。 http://dict.hjenglish.com
The results show that the radioactivity level of varied water bod-ies of the city was within normal natural background. 調(diào)查結果表明，上海市各類水體中天然放射性核素濃度屬正常本底水平。
The results show that the radioactivity level of varied water bodies of the region was within normal natural background. 調(diào)查結果表明，寧夏回族自治區(qū)水體中天然放射性核素濃度屬正常本底水平。