镧系：周期表中从镧到镏（原子序数57～71）15种按顺序排列的化学元素系列。
Lanthanide: Any of the series of 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57-71).
硼：半金属的化学元素，化学符号B，原子序数5。
Boron: Semimetallic chemical element, chemical symbol b, atomic number 5.
周期表中铀以后的任何化学元素(原子序数大于92)。
Transuranium element Any of the chemical elements after uranium in the periodic table (with atomic Numbers greater than 92).
氢：一种轻的化学元素，化学符号H，原子序数1。
Hydrogen: Lightest chemical element, chemical symbol h, atomic number 1.
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。
Iron: Metallic chemical element, one of the transition elements, chemical symbol Fe, atomic number 26.
铍：碱土金属中最轻的化学元素，化学符号Be，原子序数为4。
Beryllium: chemical element, lightest of the alkaline earth metals, chemical symbol be, atomic number 4.
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。
Iridium: Metallic chemical element, one of the transition elements, chemical symbol Ir, atomic number 77.
铈：化学元素，周期表iii b族过渡金属中丰度最大的稀土金属。化学符号Ce，原子序数58。
Cerium: chemical element, a rare earth metal of the lanthanide series (hence having many properties of the transition elements), chemical symbol ce, atomic number 58.
铈：化学元素，周期表iii b族过渡金属中丰度最大的稀土金属。化学符号Ce，原子序数58。
Cerium: chemical element, a rare earth metal of the lanthanide series (hence having many properties of the transition elements), chemical symbol ce, atomic number 58.
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