層 Simplified: 层 On the HSK 2 vocabulary list, at CEFR level A2. céng ㄘㄥˊ to pile on top of one another layer stratum floor (of a building) story sheaf math. classifier for layers 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