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Tritium has a half - life of 12.4 years.是什么意思？

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.

相关词汇
tritium has half life of years

tritium

n. 氚（氢的放射性同位素）；
例句
The Energy Secretary hopes to bring on line a safer new tritium production reactor...
能源大臣希望能投产一座更安全的新型产氚反应堆。

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；
例句
...the operation a patient has had.
病人做过的手术

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；
例句
Too often he only absorbs half the information in the manual...
他对于说明书上所说的经常是一知半解。

life

n. 生活，生计，生命，性命，一生，寿命，人生，尘世；
例句
In his later life he became even more absent-minded.
他晚年变得愈加健忘了。

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]；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；
例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
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.
详情请致电414 3925,转分机2253。
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。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
The letter was handwritten, in a hasty, barely decipherable scrawl.
这封信是仓促手写而成，潦草得几乎无法辨认。
She didn’t bat an eyelid when they told her she’d lost her job. She just calmly walked out.
他们告诉她她的工作丟了的时候，她连眼皮都没动一下，只是平静地走了出去。
As many as 40 per cent of twins have a private language that excludes the rest of the family.
多达40％的双胞胎都有自己的语言，其他家庭成员都听不懂。
One of the driest places on Earth, the Namib necessitates resourceful adaptations.
纳米比沙漠是世界上最干燥的地方之一, 在这里生活必然需要多种适应性.
He drew this conclusion on the analogy of yours.
他根据你的理论类推得出这个结论。
...as the workers dribbled away from the city square.
当工人们三三两两地离开市政广场时
They were acutely aware of the difficulties.
他们强烈地感到种种困难。
A jet plane sheared the blue sky.
一架喷气式飞机划破蓝空.
Lazy , slothful people sow poverty tomorrow.
颓惰自甘,家园终替.
...extending the boundaries of press freedom.
扩大新闻自由的界限