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氚的半衰期为12.4年,地球形成时的氚早已不存在.用英语怎么说？

氚的半衰期为12.4年,地球形成时的氚早已不存在.

Tritium has a half - life of 12.4 years.

相关词汇
tritium has half life of years

tritium

n. 氚（氢的放射性同位素）；

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；

half

adj. 一半的，半个的；n. 半，一半，（啤酒等饮料的）半品脱，（比赛、音乐会等的）半场；adv. 一半，部份地；

life

n. 生活，生计，生命，性命，一生，寿命，人生，尘世；

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；
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