Read Edit View history 週期系 zhōuqīxì periodic system Origin Definitions Defs Strokes Stroke Words Sentences Sents Senses Add sense 周期系/ 週期系 zhōuqīxì periodic system the periodic system of chemical elements; periodicity in chemistry Edit Delete References Add reference No references for this word.
周期系/ 週期系 zhōuqīxì periodic system the periodic system of chemical elements; periodicity in chemistry Edit Delete