hydrogen-
Hydrogen and oxygen combine to form water .
氢与氧化合成水。
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A molecule of water consists of two atoms of hydrogen and one atom of oxygen .
水分子由两个氢原子和一个氧原子构成。
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Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water .
两个氢原子和一个氧原子结合组成一个水分子。
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Atoms of hydrogen are fused to make helium .
氢原子可熔合成氦。
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In May engineers found a leak in a hydrogen fuel line .
5月份工程师们在一条氢燃料管线上发现一条裂隙。
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They 'd have a lot of hydrogen sulfide gas bound up in their cells .
他们的牢房里有大量的硫化氢气体。
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A hydrogen leak forced NASA to ground the space shuttle .
氢气泄漏迫使美国国家航空航天局停止了航天飞机的发射。
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Carbon , hydrogen and oxygen combine chemically to form carbohydrates and fats
碳、氢、氧化合形成碳水化合物和脂肪。
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A methane molecule is composed of one carbon atom attached to four hydrogens .
甲烷分子由1个碳原子与4个氢原子构成。
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Water is composed of hydrogen and oxygen .
水由氢气和氧气组成。
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The professor had the glass tube filled with hydrogen .
教授将一个玻璃管充满氢气。
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He is only 9 years old , but he knows that hydrogen and oxygen combine to form water .
他只有9岁，却知道氢与氧化合成水。
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A molecule of water is formed by combining two atoms of hydrogen and one atom of oxygen .
水分子是由两个氢原子和一个氧原子构成的。
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Water is a compound containing the elements hydrogen and oxygen .
水是含有氢元素和氧元素的化合物。
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Water can be resolved [ decomposed ] into hydrogen and oxygen .
水可分解为氢和氧。
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Water contains hydrogen and oxygen .
水含有氢和氧。
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The first bubbles to escape from the liquid are a mixture of air and hydrogen .
从该液体中最先逸出的气泡是空气和氢的混合物。
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Zinc displaces the hydrogen of dilute acids .
锌置换了稀酸中的氢。
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Hydrogen is a one-valence element .
氢是一价的元素。
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Qualitative analysis shows that water is made up of hydrogen and oxygen .
定性分析表明水是由氢氧结合而成的。
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Water is made up of atoms of hydrogen and oxygen .
水由氢和氧的原子构成。
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Hydrogen and oxygen are the constituents of water .
氢和氧是水的主要成分。
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But why water and not , say , hydrogen peroxide or even ammonia ?
可是，为什么是水，而不是双氧水或是氨水呢？
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Hydrogen combines chemically with oxygen to form water .
氢和氧化合成为水。
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Acids produce positively charged hydrogen atoms when dissolved in water .
酸在水中溶解时可生成带正电荷的氢原子。
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It has studied the action of hydrogen peroxide on nitrous acid .
它研究了过氧化氢对亚硝酸的作用。
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The simplest covalently bonded molecule is formed from two hydrogen atoms .
最简单的共价键分子由两个氢原子组成。
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Some balloons are filled with hydrogen , some with helium .
有的气球是用氢气充填的，有的则用氦气。
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Each of the four valency electrons of the carbon atom is shared with one of a hydrogen atom .
碳原子的四个价电子都各与氢原子的一个价电子共用。
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Catagensis is marked by a loss of hydrogen , and consequently by a decrease of the h / c ratio .
后生阶段以氢减少必然导致h／d比率降低为特征。