| 释义 |
周期zhōuqī
1.事物在运动、变化的发展过程中,某些特征多次重复出现,其接续两次出现所经过的时间叫周期。{cycle; the length of time a phenomenon or a certain characteristic of sth. takes to recur regularly in the course of movement or evolution}
2.物体作往复运动或物理量作周而复始的变化时,重复一次所经历的时间。{cycle; time during which an object completes a reciprocating motion, or a physical quantity completes a transformation process and starts a repeated one}
3.元素周期表中元素的一种分类。具有相同电子层数的一系列元素按原子序数递增顺序排列的一个横行为一个周期。同周期元素从左到右,金属性逐渐减弱,非金属性逐渐增强。{classification of elements (as in the periodic table); (in the periodic table) horizontal row of elements, which have equal number of electron layers and are arranged in an increasing order of atomic number; the metallicity of each row of elements declines, while their non-metallicity increases, from left to right} |