開區間 Save Sign in to save words Simplified: 开区间 kāiqūjiān ㄎㄞ ㄑㄩ ㄐㄧㄢ open interval (in calculus) Character by character 開(kāi)open 區(qū)area 間(jiān)between A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0