甲烷水合物主要存在于地下以及海底，由甲烷分子被锁在固态水晶体格中所组成。
Found underground and on the sea floor, methane hydrate consists of natural gas molecules trapped within a lattice of frozen water molecules.
可以预期偶氮甲烷分子具有和丙酮(CH3)2CO分子相似的丫形结构。
One might expect azomethane to have a Y structure similar to that of acetone (CH3) 2co.
天然气的主要成分是甲烷，它含有一个碳原子和四个氢原子，这项转化的关键是把一个甲烷分子变大。
The challenge is to take a molecule of methane, the main component of natural gas consisting of one carbon atom and four hydrogen atoms, and turn it into something bigger.
火星大气中含有氙气，并且氙原子和甲烷分子比较类似，以致于氙气会产生一个物理过程，即两者的相互锁定。
Mars has xenon in its atmosphere, and xenon atoms are similar enough to methane molecules that a physical process which locked up methane would lock up xenon too.
最初的证据可能是间接的——比如说，类似氧气、臭氧、甲烷和水这类物质有趣的分子的光谱条形密码——为日后可供选择的其他解释留有余地。
The evidence may be circumstantial at first — say, spectral bar codes of interesting molecules like oxygen, ozone, methane and water — and leave room for alternative interpretations.
“我们可以在另一个涉及不同分子(甲烷)的行星上研究大气循环，”埃米丽·夏特说，她是亚利桑那大学卫星和行星研究室的研究员。
"We can study the meteorological cycle on another planetary body involving a different molecule (methane)," said Emily Schaller, of the University of Arizona's Lunar and planetary Laboratory.
如果生命存在，科学家们希望这个行星上的光线能够嵌入大气层分子的化学指纹位移指示器，像氧气、甲烷一类的气体。
If life exists, scientists expect the planet's rays to be embedded with tell-tale chemical fingerprints of atmospheric molecules, such as oxygen and methane.
一氧化碳而非甲烷每一分子提供更多的能量给予饥饿的微生物。但是火星的一氧化碳含量非常稳定，比所宣称的甲烷含量还要高很多。
Carbon monoxide offers a lot more energy per molecule to hungry microbes than methane does-but Mars's carbon monoxide level is stable and much higher than the claimed methane level.
问题是，甲烷是一个极性分子还是非极性分子，我们仔细看看。
Here is the question. Is methane a polar molecule or a nonpolar molecule? Let's look carefully.
两分子甲烷含有8个氢原子，大约可生成一分子的H2，这使得该化学过程的实际氢生成量为25%至30%。
Two molecules of methane, containing eight hydrogen atoms between them, will yield roughly one molecule of H2 – this gives an effective hydrogen yield of 25 to 30 per cent from the chemical process.
甲烷水合物的分子结构是这样的，即它促进了大量气体的捕获。
The structure of the molecule of methane hydrate is such that it facilitates the capturing of a large amount of gas.
可见煤层甲烷的吸附与煤的分子结构、晶体结构和孔隙度密切相关。
Therefore, coalbed methane adsorption has close relationships with coal molecular structure, crystal structure and porosity.
象甲烷、烃这类在其它慧星上发现的含碳分子极易挥发。它们只能在极低的温度下以固体的形态存在。
The carbon-bearing molecules found on other comets, such as methane and certain other hydrocarbons, are highly volatile, meaning they only stay solid in extremely cold temperatures.
生活在甲烷溪流中的细菌把甲烷加工成复杂的分子，而蠕虫和蛤蜊则以这些细菌为食。
Bacteria living in these seeps process the methane into complex molecules, and worms and clams feast on the bacteria.
他们提出，阳光分解大气中的甲烷和氮分子，然后重新组合变成球形颗粒。
They propose that sunlight broke apart atmospheric methane and nitrogen molecules that then rejoined to make spherical particles.
本文借助最大重叠杂化轨道理论，研究了卤代甲烷系列分子的红外伸缩频率，基团电负性和质子酸度等分子性质与结构的关系。
The maximum overlap method was used to study the relationships the C-H stretching frequencies, group electronegativities and proton acidity properties and the molecular structure in the halomethanes.
注意事项(1)二氯甲烷加入五氧化二磷蒸馏，加入分子筛储存。
Note. (1) The dichloromethane is distilled from phosphorus pentoxide and stored over molecular sieves.
天然气水合物是由水分子和天然气分子在一定温度和压力下形成的似冰雪状结晶化合物，又称笼形水合物或“可燃冰”。由于形成天然气水合物的气体主要为甲烷，因而也常被称为甲烷水合物。
Gas hydrate is a ice-like crystalline compound, formed by water molecules and natural gas molecules under certain temperature and pressure conditions, also called clathrate hydrate or "fire ice".
天然气水合物是由水分子和天然气分子在一定温度和压力下形成的似冰雪状结晶化合物，又称笼形水合物或“可燃冰”。由于形成天然气水合物的气体主要为甲烷，因而也常被称为甲烷水合物。
Gas hydrate is a ice-like crystalline compound, formed by water molecules and natural gas molecules under certain temperature and pressure conditions, also called clathrate hydrate or "fire ice".
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