These minerals can be dated by radioactive decay techniques because of the very small quantities of radioactive trace elements they, in turn, contain.
这些矿物可以用放射性衰变技术测定年代，因为它们所含的放射性微量元素非常少。
Radon, the radioactive gas given off from the decay of naturally occurring uranium in soil, has been noted by the EPA to be a major environmental cause of lung cancer.[5]The
氡，放射性气体，由泥土中自然出现的铀衰变中释放。EPA已经注意到它是肺癌的主要环境原因。
And alarmist politicians and doomster academics may, in pointing to the state of decay, miss a nation's continuing strengths and attractions, which have to be weighed against its problems and worries.
而杞人忧天的政客和末日论的学者们则可能在指出衰减状态的同时也遗漏了国家持续的国力和吸引力，这些都应该与面临的问题和担忧受到同等重视。
But will Mr Obama be more successful with the neighbours than Mr Bush, who was accused of allowing his country's influence in Latin America to decay?
布什被指责道使美国在拉美的影响力减退，那奥巴马会比布什在睦邻关系上更成功吗？
How much being pregnant contributes to cavities could be tested, says Larsen, by comparing the incidence of tooth decay in women and men in modern populations before and after boosts in fertility.
Larsen说，通过对生育率提高前后现代人口中妇女和男子蛀牙发病率的比较，就能够测出多少龋齿是由正在怀孕的妇女贡献的。
However, the nucleons in nucleus will decay and baryon-number conservation may not be absolute according to the Grand unified theory.
而大统一理论则预言在原子核中的核子将衰变，重子数守恒将被破坏。
In so doing, the karma stored in one's form, along with the cellular dissonance that causes decay, aging or illness, can begin to be dissolved.
当这样做，贮藏在形态中的业力和引起衰减、老化或疾病的非谐振细胞能被溶解。
This effect can be measured in either the time domain by observing the rate of decay of voltage or in the frequency domain by measuring phase shifts between sinusoidal currents and voltages.
这个效应可以在时间域通过观测电压的衰变率来测量，也可以在频率域通过正弦电流和电压之间的相变来测量。
Part of the reason must be the change in diet, from the bounty of summer to the decay of late fall and the deprivation of winter.
部分原因是食物的改变，从食物丰盛的夏季到食物渐少的秋末再到一片荒芜的冬季。
Much of the spiritual decay in our society-including the breakdown of the family-can be attributed to selfish and abusive men.
我们社会中的很多精神蜕变- - -包括家庭的解体——都“归功”于自私和暴虐的男人们。
Radioactive ion beams with different decay modes and half-lives can be applied in many aspects of bio-medical fields.
不同衰变方式和半衰期的放射性核束在生物医学领域有不同应用。
The impact of system parameters on the minimum decay rate is analyzed in detail, which suggests that a new parameter, named the integrated loss-rate coefficient can be defined.
进一步分析了系统参数对衰减率的影响，分析表明可以定义一个新的综合去除系数。
The decay of the mulberry fruits in the storage can be divided into 3 types, i. e. fermentation, mouldiness and white spottedness.
果桑果实贮藏中的腐烂主要有发酵、霉烂和白化3种类型；
But it should be stressed that the conductivity decay of P-type doped polyacetylene can be significantly suppressed by immersion of the doped polyacetylene film in some concentrated aqueous solutions.
但是需要强调的是P -型掺杂的聚乙炔的比电导的衰变会由于掺杂的聚乙炔插在某些浓的水溶液中而得到有效的抑制。
In theory, the influence of the exponential DC component on the fundamental wave component with random decay time constant can be completely eliminated with the algorithm.
理论上新算法可以消除任意衰减时间常数的直流分量对所求各次谐波分量的影响。
Whatever may be true in regard to the necessity of decay, and caries, and pain, most parents have already so managed, and their ancestors before them, that suffering will come to their children.
无论是关于衰变的必要性，和龋齿，和痛苦的真实，大多数父母已经使管理，他们的祖先在他们之前，这种痛苦会来自己的孩子。
Wedge-shaped structure which is isolated from massive diamictite may be filled with the decay of an ice wedge in periglacial environment.
楔状构造则可能是冰缘环境的冰楔体融化泄水的结果；
Lactic acid can be used as an active ingredient in toothpaste and other oral hygiene products to prevent tooth decay and freshen breath.
乳酸可用作牙膏和其它口腔卫生品的活性物以防龋齿及保持口腔清洁。
The large eddy simulation methods can be used to analysis and calculate the decay and transport rules of wake vortex in near ground phases, but it′s too complex and difficult to use.
采用大涡模拟方法可以分析和计算近地阶段尾涡消散和运动规律，但模型繁琐、计算复杂。
The treatment can be used to describe the effect of cross angle and density ratio on the axial velocity decay in fully developed jet flow.
该法可较好地描述射流交叉角度、密度比对轴线上轴向速度的影响。
Any problems can be detected and corrected at your child's regular dental checkups. As long as the sealants are in place, decay is less likely to develop in the grooves.
通过定期的口腔检查，可以及时发现这些问题，并修复已经被窝沟封闭的牙齿，患咬合面蛀牙的机率会减少。
The strength and decay rate of biodegradable fixation device can be monitored and improved by means of in vitro degradation tests.
目前可降解式固定器所面临最大的难题在于强度的大小及降解时间的维持。
If the earthquake takes place in a hot season, the dead bodies of human and animal would decay rapidly and pollute the environment seriously, so they must be dealt with as quickly as possible.
地震时，如正值天气炎热，则人、畜尸体迅速腐烂，严重污染环境，必须尽快处理。
Advantage: Bear the heat, the anti - decay, refractoriness under load is high. It is suitable to be used in different high temperature kiln stove.
优点：耐高温，抗腐蚀，荷重软化点高，适合在各种气氛条件下的高温炉中使用。
Advantage: Bear the heat, the anti - decay, refractoriness under load is high. It is suitable to be used in different high temperature kiln stove.
优点：耐高温，抗腐蚀，荷重软化点高，适合在各种气氛条件下的高温炉中使用。
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