eccyclema

例句：

1. 1. The eccyclema of the chemical element is a series of periods in which the elements are arranged according to their atomic number.
   化学元素的周期表是按照原子序数排列的一系列周期。
2. 2. In the eccyclema, the first period contains the noble gases, followed by the metals and then the non-metals.
   在周期表中，第一周期包含稀有气体，然后是金属，接着是非金属。
3. 3. The discovery of new elements in the eccyclema has been a major breakthrough in the field of chemistry.
   在周期表中发现新元素是化学领域的一大突破。