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。
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。
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。
So they represented this chemical element with a solar symbol.
所以他们用太阳符号来代表这种化学元素。
Nitrogen: Gaseous chemical element, chemical symbol n, atomic number 7.
氮：气态化学元素，化学符号N，原子序数7。
Boron: Semimetallic chemical element, chemical symbol b, atomic number 5.
硼：半金属的化学元素，化学符号B，原子序数5。
Iodine: Nonmetallic chemical element, chemical symbol I, atomic number 53.
碘：非金属化学元素，化学符号I，原子序数53。
Bromine Nonmetallic chemical element, chemical symbol Br, atomic number 35.
非金属化学元素，化学符号Br，原子序数为35。
Phosphorus Nonmetallic chemical element, chemical symbol P, atomic number 15.
非金属化学元素，化学符号P，原子序数15。
Mercury (quicksilver): Metallic chemical element, chemical symbol Hg, atomic number 80.
汞（亦称水银）：金属化学元素，化学符号Hg，原子序数80。
In the environment, some chemical element that is too many or lacks can affect the human body health.
环境中某种化学元素过多或缺乏都会影响人体的健康。
Iron: Metallic chemical element, one of the transition elements, chemical symbol Fe, atomic number 26.
铁：金属化学元素，为过渡元素的一种，化学符号Fe，原子序数26。
Beryllium: chemical element, lightest of the alkaline earth metals, chemical symbol be, atomic number 4.
铍：碱土金属中最轻的化学元素，化学符号Be，原子序数为4。
Silver: Metallic chemical element, one of the transition elements, chemical symbol Ag, atomic number 47.
银：金属化学元素，过渡元素之一，化学符号Ag，原子序数47。
Iridium: Metallic chemical element, one of the transition elements, chemical symbol Ir, atomic number 77.
铱：金属化学元素，为过渡元素的一种，化学符号Ir，原子序数77。
Chromium: Metallic chemical element, one of the transition elements, chemical symbol Cr, atomic number 24.
铬：周期表VIb族金属化学元素，是过渡元素元素之一，化学符号Cr，原子序数24。
Oxygen, the most abundant chemical element, is present in combination with hydrogen to the extent of 89 percent in water.
在水中，氧这种最丰富的化学元素与氢结合，其含量多达89%。
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。
In this thesis, we study the chemical element content change in suspension, solution and sediment state when in low, high and normal flow season.
研究化学元素在枯、丰、平三个水季悬浮态、可溶态、沉积态的含量变化。
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。
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 accumulation and distribution rule of productivity and nutrient element were studied by determining the biomass and chemical element in different organs above ground of sample trees.
通过对样地水曲柳天然林的各器官生物量的测定和化学元素分析，研究了生物生产力及营养元素的积累与分布规律。
Radon: Chemical element, chemical symbol Rn, atomic number 86.
氡：化学元素，化学符号Rn，原子序数86。
Radon: Chemical element, chemical symbol Rn, atomic number 86.
氡：化学元素，化学符号Rn，原子序数86。
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