常見例句雙語例句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(guān)緊要的。http://dict.hjenglish.comThe results show that the radioactivity level of varied water bod-ies of the city was within normal natural background.調(diào)查結(jié)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(diào)查結(jié)果表明，甯夏廻族自治區(qū)水躰中天然放射性核素濃度屬正常本底水平。 返回 natural background level