窗口 On the HSK 6 vocabulary list, at CEFR level C2. chuāngkǒu ㄔㄨㄤ ㄎㄡˇ window opening providing restricted access (e.g. customer service window) computer operating system window fig. medium intermediary showpiece testing ground Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT