镭是一种化学元素。
Uranium is a chemical element.
铀是一种化学元素。
镭和铀是放射性元素。
Zinc is a chemical element which is very important to our health.
锌是一种对人体健康很有益处的元素。
Lead is a chemical element that can be used in building construction.
铅是一种化学物质，可以作为建材使用。
The valid means that constructs the atmosphere is a chemical element that USES flexibly the basic lines, main tone and patterns to constitute.
营造氛围的有效手段就是灵活运用基本的线条、主色调和图案构成的元素。
Isotope: One of two or more species of atoms of a chemical element having nuclei with the same number of protons but different Numbers of neutrons.
同位素：一种化学元素的两个或多个类型，它们的原子核具有相同的质子数，而中子数却不同。
The isotopes of a given element have the same chemical properties but slightly different physical properties.
一个特定元素的同位素具有相同的化学特征，但在物理性质上有一些细微差异。
Each pattern stands for a distinct chemical element, and so different sets or patterns of spectral lines mean that the star has a different chemical composition.
每一种样式代表一种不同的化学元素，所以光谱线的不同集合或模式意味着这颗恒星有不同的化学成分。
This light is passed through a prism, which breaks it up into a spectrum, and a unique pattern, kind of like a chemical fingerprint of spectral lines for that element appears.
铁块会一直加热，直到到达某一燃点，便会辐射出光来；而当它的光线穿过一块棱柱时，棱柱就会分割光线，形成光谱。
Isotopes are different atomic versions of a particular chemical element.
同位素是一个特定化学元素的不同原子变种。
Similarly, in a chemical formula the subscript comes after the element name, not before.
类似地，化学方程式中要先写元素名字后写个数，而不是反着。
The chemist found a new chemical element.
那位化学家发现了一种新的化学元素。
Hydrogenation: Chemical reaction between molecular hydrogen (H2) and another element or a compound, usually in the presence of a catalyst.
氢化：通常在有催化剂的情况下，氢分子(H2)与其它元素或化合物之间的化学反应。
Also, silicon is a very common chemical element, whereas germanium is relatively rare.
除此之外，相对于含量稀少的锗元素，硅是相当普遍的化学元素。
The individual chemical property of the element made it a good catalyst.
这种元素的特殊化学特性使其成为一种好的催化剂。
It is the discovery of a new chemical element.
它是一种新化学元素的发现。
A nonmetallic element, such as arsenic, that has some of the chemical properties of a metal.
准金属，类金属具有一些金属化学特性的非金属元素，例如砷。
This study investigated chemical element concentrations in calcite, calcareous soil and restored plants in a limestone rocky desertification area in Huaxi, Guizhou Province.
对贵州花溪区石灰岩、石灰土及定居植物中化学元素含量进行研究。
The correlation analysis showed that the spectrum from a morphological element is highly correlated with that from the corresponding purified chemical.
基元谱与提纯化学物质谱的相关分析印证了组织形态基元谱的来源。
The atom is the smallest particle of an element that can have a separate existence of take part in a chemical reaction.
原子是元素的最小粒子，它能单独存在或参与化学反应。
Kind of like a chemical finger print of spectral lines for that element appears.
一个化学元素的样式就被光谱线显现出来了。
A structure the size of an atom represents a fundamental limit: to make anything smaller would require manipulating atomic nuclei—essentially, transmuting one chemical element into another.
单原子的结构是个基本极限：若要做得更小，基本上就得操控原子核了，这可是把一种化学元素转换为另一种。
The chemical formula also shows the number of atoms of each element in one molecule of a compound.
和该化合物中每个分子所含每种元素的原子量的数目。
Each chemical element emits24 gamma rays of a different energy, so this would reveal the identities of the elements in the paint.
不同的化学元素会释放出不同能量级的伽马射线，这些射线昭示了壁画上的元素种类。
The structure of the a-long-chain alkylbetaines was characterized by chemical analysis, element analysis, infrared spectrum, nuclear magnetic resonance and mass spectrometry.
采用化学分析、元素分析、红外光谱、核磁共振及质谱等方法对产品进行了表征。
Mineral: a naturally occurring inorganic element or compound having an orderly internal structure and a characteristic chemical composition, crystal form, and physical properties.
矿物：一种天然形成的无机元素或化合物(无机物)，它有着有序的内部构造、特有的化学成分、结晶形式和物理性质。
The term element refers to a pure substance with atoms all of a single kind. At present 107 chemical elements are known.
元素这一术语是指由单一种类的原子所组成的纯物质。现在已经知道有107种元素。 收藏。
A chemical constituent (element or compound) of an alloy, which may be used to specify its composition.
合金的任一组成(以是元素或化合物)可以被用于区分其构成成分。
The term element refers to a pure substance with AToms all of a single kind. AT present 107 chemical elements are known.
元素这一术语是指由单一种类的原子所组成的纯物质。现在已经知道有107种元素。
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