基本解釋[地球科學(xué)]自然基準(zhǔn)英漢例句雙語例句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(duì)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。natural background level更多例句詞組短語短語natural radioactive background level 天然放射性本底natural background level更多詞組專業(yè)釋義地球科學(xué)自然基準(zhǔn)