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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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他当众承认自己可能犯了个错误。
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使飞机减速的螺旋形气流涡旋
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你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
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He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
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他们已组织了一批非常出色的演员来参加我们的演出.
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Tritium has a half - life of 12.4 years.
氚的半衰期为12.4年,地球形成时的氚早已不存在.
The tragedies begin to interlock.
悲剧开始相互交叠。