period half-life
英
美
- half n.一半；下半场；半学年adj.一半的；不完全的adv.一半地；不完全地
- life n.一生；生命；生活；人生
- period n.一段时间；周期；时期；课时；学时；句号；月经
- The time it takes for half of its original amount to decay is called the half-life.
衰变至只剩下原来数目一半所需的时间称为该核素的半衰期。
- It is not necessary to wait until half of a sample has decayed in order to measure the halflife.
不必一直等到样品衰变一半之后才测量它的半衰期。
