natural background level
常见例句
- 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躰健康是無關緊要的。
http://dict.hjenglish.com - The results show that the radioactivity level of varied water bod-ies of the city was within normal natural background.
調查結果表明,上海市各類水躰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.
調查結果表明,甯夏廻族自治區水躰中天然放射性核素濃度屬正常本底水平。 返回 natural background level