常見例句雙語例句The discovery also explains why helium is found in radioactive mineral deposits.這個發(fā)現(xiàn)也解釋了為什么在放射性礦渣中找到了氦。dict.cnThe content of radioactive radium in mineral was 19 times higer than that in rock and served as a chief source of radon.礦石樣品放射性鐳含量比巖石樣品高19倍，為井下氡氣的主要來源；It results from cosmic rays reaching the earth from the outer space, and from the radioactive decay of mineral in the soil.它來自星際空間抵達(dá)地球的宇宙射線，來自土壤中礦物質(zhì)的放射性衰變。 返回 radioactive mineral