週期系 Save Sign in to save words Simplified: 周期系 zhōuqīxì ㄓㄡ ㄑㄧ ㄒㄧˋ periodic system periodicity (chemistry) Character by character 週(zhōu)week 期(qī)period 系(xì)connect A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0