周期系 Save Sign in to save words Traditional (Taiwan): 週期系 zhōuqīxì ㄓㄡ ㄑㄧ ㄒㄧˋ periodic system periodicity (chemistry) Character by character 周(zhōu)surname Zhou 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