当一个化合物被分解的时候，原子有恢复原来未曾改变的面貌。
And when a compound is decomposed, the atoms are recovered unchanged.
在确定一个化合物的结构式之前，首先应知道它的分子式。
Before we can assign a structural formula to a compound, we must first know its molecular formula.
大多的化学鉴别情况下，如何发现第一个化合物极为重要。
As with most chemical exploration, it is important to have an idea of what compounds are being searched for in the first place.
测试每一个化合物将是巨大而非常昂贵的工作——考虑到传统药物的数量，这是沧海一粟。
Testing each compound would be a huge and very expensive undertaking - a drop in the bucket considering how many traditional medicines there are.
一个化合物分子可由一种以上不同形式的化学结构式来表示的现象，称之为化学结构表示的歧义性。
The phenomenon that one compound can be represented by more than one structural diagrams is called ambiguity of chemical structure.
失败于合成一个化合物，不能观察到特殊性质或者不能影响一个特殊的反应，这些对于判定那个化合物及其性质，反应不存在并非积极证据。
The failure to synthesize a compound, to observe a particular property, or to effect a particular reaction can never be positive proof of the nonexistence of that compound, property, or reaction.
然而，尽管当地铁浓度立即提高，在一个这样的区域实验释放铁化合物却没有产生大量的浮游生物。
However, an experimental release of iron compounds into one such area failed to produce a thriving plankton population, even though local iron concentrations increased immediately.
咖啡还含有葫芦巴碱，这是一种抗菌的化合物，它不仅提供良好的香气，而且可能是预防龋齿的一个因素。
Coffee also contains trigonelline, an antibacterial compound that not only gives it a wonderful aroma but may be a factor in preventing dental caries.
日本名古屋大学的另一个团队已经测试了可以作为储能材料的钙化合物。
Another team at Nagoya University in Japan has tested calcium compound as an energy storage material.
而后当研究人员用一张膜过滤溶液时，表面活性剂被排出，化合物们立马自发重组为一个活力焕发的成形光电管。
Then, when the researchers removed the surfactant by pushing the solution through a membrane, the compounds spontaneously assembled once again into a perfectly formed, rejuvenated photocell.
不同的元素或化合物吸收并释放不同颜色的光波，通过对一个恒星的光谱进行研究，我们能够推测它可能的成分。
Different elements or compounds absorb and emit different colors or wavelengths of light, and by studying a star's spectrum, one can divine what its composition might be.
将被细菌吃掉的原油所占比重成为一个未知数。细菌吃石油本质上是将无害化合物提炼出来并将其纳入食物链。
An unknown percentage of the oil would have been eaten by bacteria, essentially rendering the compounds harmless and incorporating them into the food chain.
电流在一个方向上电解化合物，两种金属在相反电极上沉淀。
Applying a current in one direction splits the compound, and the two metals are deposited onto opposite electrodes.
最常检测到的化学化合物是(HOH)，氧(O)是它的一个原子。
The most frequently detected chemical compound is water (HOH) with oxygen (o) as one of its atoms.
美国的一个小组发现，被称为恶二唑的化合物可以针对血吸虫生存所需的酶。
A team in the United States found that chemical compounds known as oxadiazoles can target an enzyme needed for the survival of Schistosoma.
在感染的最后一个阶段，病毒破坏掉了感染的细胞，病在这个过程中释放出大量的难解化合物。
At the final stage of the infection, the viruses destroy the cells they have infected, a process that provides a rich source of refractory compounds.
另外一个需要单独加以考虑的问题是，一些金属或者化合物会渗入卤水。
A separate problem may be that some metals or chemicals leach into the brine.
但是一个在分子方面的专利——比如一种能治病的独特的化合物——很长一段时间别人都不可能生产出类似的产品来。
But a patent on a molecule-such as a compound that treats a disease in a unique way-creates a period of protection during which no one else can sell the molecule for that particular purpose.
只要两种化合物或矿物之间能交换电子，它们就是一个能量源，就像一个微小的电池。
As long as you can find two chemicals or minerals that can transfer an electron between them, you've got an energy source, a microscopic battery of sorts.
加州大学河滨分校的一位和他们合作撰写关于这个新化合物的论文的化学教授盖伊·贝特兰德(Guy Bertrand)说：“这几乎就像是把一个原子变成另一个原子。”
"It's almost like changing one atom into another atom," said Guy Bertrand, a UCR chemistry professor who co-authored a paper on the new compound.
这些药物由“临床资料公司”(Clinical DataInc .)制造，是一个5 - HT再摄取抑制剂与5ht1a激动剂的化合物。
The medication, manufactured by Clinical Data Inc., is a combined serotonin reuptake inhibitor and 5ht1a agonist.
这种方法比其他的更有效，因为它向构造中的碳氢化合物一次引入两个碳原子而不是一个。
The method is more efficient than others because it adds two carbon atoms at a time, rather than one, to the hydrocarbon molecules being formed.
但是，它根本不是一个低碳水化合物的饮食。
从生化角度讲，碳水化合物是一个含有碳，氢，氧元素的简单化合物。
On a biochemical level, a Carbohydrate is a simple fusion of carbon, hydrogen and oxygen molecules.
我们面临的问题是，我们的能源政策在很长的一个时期忽视了美国境内的碳氢化合物，现在我们要为此付出代价。
What is happening is that we have had an energy policy that neglected hydrocarbons in the United States for a long period of time, and now we are paying the price.
简单碳水化合物也被称作“单糖”，由一个或两个糖分子组成。
Simple carbohydrates are classified as “Monosaccharides” and chemically consist of one or two sugar units.
它隶属于一个更为庞大的化学物质家族——有机锡，它们是由锡和碳氢化合物构成的，而其与肥胖症的联系也只是最近才发现的。
Tributyl tin is part of a larger group of chemicals known as organo-tins, which combine tin and hydrocarbons; the link with obesity was discovered only relatively recently.
能量饮料含有复杂的混合缓慢，中期和快速署理糖，并能供应能量的碳水化合物，以身体一个较长时期内的时间。
Energy drinks contain complex carbohydrates - a blend of slow -, medium - and fast-acting sugars - and are able to supply energy to the body over an extended period of time.
能量饮料含有复杂的混合缓慢，中期和快速署理糖，并能供应能量的碳水化合物，以身体一个较长时期内的时间。
Energy drinks contain complex carbohydrates - a blend of slow -, medium - and fast-acting sugars - and are able to supply energy to the body over an extended period of time.
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