事实上，银河系中24%的元素质量是由氦组成的，这使它成为宇宙中第二丰富的元素。
In fact, 24 per cent of our galaxy elemental mass consists of helium, which makes it the second most abundant element in our universe.
一段关系是由两个独一无二的个体组成的。
当我们检查研究支出时，我们发现，在我国每年花费的350多亿美元中，几乎三分之二是由联邦政府支出的。
When we examine expenditures for research, we find that of the more than $35 billion spent each year in this country, almost two-thirds is spent by the federal government.
对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。
Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.
石墨烯最早在2004年诞生于一个实验室，本质上是一层由纯碳原子组成的蜂窝状晶格层，薄到竟被认为是二维物质。
First produced in a lab back in 2004, graphene is essentially a single layer of pure carbon atoms bonded together in a honeycomb lattice so thin it's actually considered two-dimensional.
屏幕中仅三分之一是由各种原色占有，其余三分之二的潜在输出色也就浪费了。
With only one-third of the screen occupied by each primary, two-thirds of the potential output is wasted.
干木材重量的大约一半是由碳组成的，如果树腐化了，或被燃烧了，大部分碳都会以二氧化碳的形式释放出来。
Roughly half the dry weight of a tree is made up of stored carbon, most of which is released when the tree rots or is burned.
该机器的原型是由美国和瑞士的研究者们设计的。它利用一个石英窗和腔体将太阳光聚集到一个充满二氧化铈的缸体中。
The prototype, which was devised by researchers in the us and Switzerland, USES a quartz window and cavity to concentrate sunlight into a cylinder lined with cerium oxide, also known as ceria.
一到二磅的超压是由正常飞行高度的超音速飞机制造的。在1.5到2磅之间时可能会引起一些公众反应。
Overpressures of 1 to 2 pounds are produced by supersonic aircraft flying at normal operating altitudes. Some public reaction could be expected between 1.5 and 2 pounds.
二进制类格式实际上是由JVM规范定义的。
The binary class format is actually defined by the JVM specification.
我们观察到的第二种建模错误是由某一流程模型中对同一活动的重用造成的。
A second modeling error that we observed results from the reuse of the same activity within a process model.
目前，我们释放到大气的二氧化碳中一半被陆地和海上吸收—大部分是由植物通过光合作用吸收。
Currently half the carbon we release into the atmosphere gets absorbed by land and sea-much of it by plants, which take in carbon dioxide in the process of photosynthesis.
第二项研究是由布朗大学和南加州大学的研究人员发现的，研究发现戒烟对心理和身体健康均有改善。
A second study from researchers at Brown University and the University of Southern California has found that giving up smoking improves mental health as well as physical health.
在科学家周二发布的新哈伯照片中，微弱的粉色和黄色星云是大部分是由星云中心的新星发射的紫外线加热的氢气组成。
The wispy pink and yellow cloud in the new Hubble photo, which scientists released Tuesday, is made of mostly hydrogen gas heated by fierce ultraviolet radiation from the new stars at its heart.
2007年，日本经济增长的三分之二是由出口盈利贡献的。
In 2007, export earnings accounted for two-thirds of Japan's economic growth.
事实上，大约三分之二的质量小于海王星的已知系外行星是由HARPS单独检测到的。
In fact, HARPS alone has detected about two-thirds of all known exoplanets with masses less than that of Neptune.
全球变暖是由臭氧层破洞和不断积累的二氧化碳造成的。
Global warming is caused by holes in the ozone layer and the steady buildup of carbon.
MOSFET的输入二极管是由一个电场控制在门区，因此总是输入阻抗非常高，因为没有正向偏置二极管，以降低输入阻抗。
The MOSFET input diode is controlled by an electric field in the gate region, thus the input impedance is always extremely high because there is no forward biased diode to lower the input impedance.
这里侧向力很大，我们预测左前胎会粒化，尤其是由半径增加的二号弯和倾斜度增大的13号弯造成的。
There are very high lateral forces and we expect to see graining on the front left tyres, especially caused by the increasing radius turn two and the banked turn 13.
例如，据估计，2004年肺癌患者总数的3-14%是由室内氡暴露引起的，这也是许多国家第二大肺癌发病原因。
For example, indoor radon exposure was estimated to cause between 3-14 % of all lung cancers in 2004, the second most important cause of lung cancer in many countries.
五岁以下儿童死亡中三分之二以上是由一些可通过负担得起的简单干预措施得以预防和治疗的疾病所导致。
Over two thirds of under-five child deaths are due to diseases that are preventable and treatable through simple, affordable interventions.
第二个是由最受大家喜爱经自由派创办的网络报纸赫芬顿邮报举办的舞会。
The second hot ball was given by the Huffington Post, the liberal establishment's favourite online newspaper.
石墨烯是由单层碳原子紧密堆积成二维蜂窝状晶格结构的一种碳质新材料，具有一些独特的物理特性。
Graphene is a honeycomb-like sheet of carbon just one atom thick with a number of unique physical properties.
更糟糕的是由商品价格走高所引发的第二轮冲击波让中央银行的日子更加难过。
Worse, a second shock-higher commodity prices-has made life doubly difficult for central Banks.
更糟糕的是由商品价格走高所引发的第二轮冲击波让中央银行的日子更加难过。
Worse, a second shock—higher commodity prices—has made life doubly difficult for central banks.
这种动物是科学家胚胎学试验的最爱，因此它的基因组序列已被测出（恰好，部分是由霍夫曼博士测得），所以对它早已了解的一清二楚。
This animal is a scientists' favourite for embryological experiments, and has thus had its genome sequenced (in part by Dr Hofmann, as it happens), so it is well understood.
这种动物是科学家胚胎学试验的最爱，因此它的基因组序列已被测出（恰好，部分是由霍夫曼博士测得），所以对它早已了解的一清二楚。
This animal is a scientists' favourite for embryological experiments, and has thus had its genome sequenced (in part by Dr Hofmann, as it happens), so it is well understood.
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