音標(biāo)發(fā)音英式音標(biāo) [?hɑ?f.la?f]美式音標(biāo) [?h?f.la?f]英式發(fā)音 美式發(fā)音 基本解釋n.半衰期同根派生 half-life相關(guān)詞英漢例句用作名詞 (n.)The time it takes for half of its original amount to decay is called the half-life.衰變至衹賸下原來(lái)數(shù)目一半所需的時(shí)間稱爲(wèi)該核素的半衰期。It is not necessary to wait until half of a sample has decayed in order to measure the halflife.不必一直等到樣品衰變一半之後才測(cè)量它的半衰期。half-life更多例句英英字典劍橋英英字典 the length of time needed for the radioactivity of a radioactive substance to be reduced by halfhalf-life劍橋字典half-life柯林斯字典