殼 Simplified: 壳 On the HSK 7-9 vocabulary list, at CEFR level C2. ké ㄎㄜˊ shell (of an egg, nut, crab etc) coll. case casing housing (of a machine or device) qiào ㄑㄧㄠˋ shell bound form 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