half-life
音標發(fā)音
- 英式音標 [?hɑ?f.la?f]
- 美式音標 [?h?f.la?f]
- 英式發(fā)音
- 美式發(fā)音
基本解釋
- n.半衰期
英漢例句
- The time it takes for half of its original amount to decay is called the half-life.
衰變至只剩下原來數(shù)目一半所需的時間稱為該核素的半衰期。 - 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后才測量它的半衰期。
用作名詞 (n.)
英英字典
- the length of time needed for the radioactivity of a radioactive substance to be reduced by half