All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.
给定元素的所有同位素都含有相同的质子数，但它们的中子数不同，因此它们的原子质量也不同。
Then I have the total mass of A divided by the number of moles of A.
然后是A的总质量,除以A的摩尔数。
A number of studies have shown that the presence of a critical mass of women in senior jobs is positively correlated with a company's performance and possibly with higher profits.
一些研究表明，决策层女性占关键多数可能和公司业绩改善、利润提高有关。
A number of medications are available to help slow bone loss and maintain bone mass, including bisphosphonates (Fosamax, Actonel, Boniva) and raloxifene (Evista).
许多药物治疗可以有助于减缓骨质流失和保持骨量，其中包括二膦酸盐(福善美、Actonel、Boniva)和雷洛昔芬(Evista)。
Here is the mass per number of sheets with a linear fit.
根据下面的线性拟合图可以算出每张纸的质量。 横轴为纸张数量，纵轴为相应数量的纸张的总质量（单位：克）。
That number is likely to grow as a slew of major U.S. companies have announced mass layoffs this month.
这一数字很可能会继续增长，因为一系列美国大公司本月已宣布大规模裁员。
Inside these nations there will be mass prosperity, but with a large minority in serious poverty, and a small number who are very rich.
这些国家虽然呈现出欣欣向荣的态势，但是其中还有许多极端贫穷的弱势人群，还有少量富有人群。
Mass customisation USES some of the techniques of mass production; for example, its output is based on a small number of platforms, core components that underlie the product.
大规模定制运用了一些大规模生产的方法；比如说，大规模定制的产品都是基于一些小的标准集合，核心部件来构成产品的。
But in recent years astronomers have used radial velocity to find or confirm a number of planets down to a few times Earth's mass.
但是，近年来天文学家通过径向速度法去发现或证实大量小到只有几倍的地球质量的行星。
Indeed a number of carmakers are looking at ways to mass-produce cars built from composites, including BMW, which is developing a range of urban electric vehicles.
事实上很多的汽车制造商正在寻找运用复合材料批量生产汽车的方法，其中就包括BMW，他们正在开发一系列的城市电动车。
You just need a few macroscopic variables that are very familiar to you, like the pressure, the temperature, the volume, the number of moles of each component, the mass of the system.
你只需要某些你非常熟悉的宏观变量，比如压强，温度，体积，每个组分的摩尔数，系统的质量。
Getting a better picture of the Milky Way's mass and its structure may ultimately rely on a number of methods.
要更好地知道银河系的质量和结构最后可能要依赖多种方法。
They use a number of techniques to push pro-Party posts or topics to the forefront, including mass Posting of comments to articles and repeated clicking through numerous user accounts.
他们使用各种技术将爱党的相关帖子话题推至前台，包括灌水和用多个帐户重复点击。
And the number of U.S. states with more than 30 percent of their population topping a body mass index (BMI) of 30 tripled between 2007 and 2009.
在美国，超过30%人口超过体重指数(BMI)30的洲数量从2007年到2009年翻了三倍。
As you age, a number of changes occur in your skeletal muscles, which are the ones that move your arms, your legs and the rest of your body. You lose muscle mass — you simply have less of the stuff.
当你上了年纪，那些手臂、腿部和身体其它部分动作所需的骨骼肌肉会发生一系列变化。
Construction of a mass rapid-transit railway is due to start in 2011, but with the number of passengers expected to reach just 400,000 a day by 2020 it will hardly ease the congestion.
一项大规模高速运输轻轨交通系统定于2011年动工。但是预计到2020年乘客数量每天将达40万人次，因此即使该高速运输系统投入使用也很难缓解拥堵的压力。
However a number of documents dating from a 1990s Russian probe into Katyn, which include the names of those who committed the mass executions, remain classified.
20世纪90年代俄罗斯对卡廷事件进行过调查，涉及到执行大规模处决行动的部分人员，然而，这些文件对他们的名字仍然实行严格保密。
The mass media affects the lives of our young by acting as a(an) 1 for a number of institutions and social contacts.
大众媒体作为许多机构和社会交往的替代品影响着年轻人的生活。
Number one is we lose a percentage of our muscle mass on a yearly basis.
第一位的是我们失去每年的肌肉质量的百分比。
Templates provide the simplest means of setup and mass deployment of an Enterprise Replication system for IBM customers with a large number of tables.
模板为拥有大量表的IBM客户提供了最简单的方式来设置和大规模部署EnterpriseReplication系统。
Into mass absorption phase, began to collect and reflect a large number of related information.
进入大量吸收期，开始大量收集和思考与之相关的资料。
Mr Santoni reckons McLaren could make around 5, 000 cars a year this way—a number that, for supercars, almost constitutes mass production.
Santoni先生计算迈凯轮一年可以造大约5000辆车。
This is a small number and it is anyone's guess if it constitutes a critical mass.
这是一个小数目，这是任何人的猜测，如果它构成临界质量。
There have been a lot of ways of acquiring knowledge. And the number is increasing unexpectedly owing to the popularization of modern mass media.
有很多获得知识的方法，而由于现代大众传媒的普及，(获取知识方法的)数量也在以意料之外的速度增长。
The term posterization is used because it can influence your photo similar to how the colors may look in a mass-produced poster, where the print process USES a limited number of color inks.
长期色调分离使用，因为它可以影响你的照片，类似的颜色可能看起来如何在大规模生产的海报，打印过程中使用数量有限的彩色墨水。
Thirdly, Pilot projects will be launched for mass drug purchasing by public bidding in order to reduce the number of intermediate links and facilitate a fair, public and equitable drug trade.
第三，对大宗药品销售应该开展试点项目，来减少中间商的数目，并且促进一个公平、公开、平等的药品销售市场。
Thirdly, Pilot projects will be launched for mass drug purchasing by public bidding in order to reduce the number of intermediate links and facilitate a fair, public and equitable drug trade.
第三，对大宗药品销售应该开展试点项目，来减少中间商的数目，并且促进一个公平、公开、平等的药品销售市场。
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