手足胼胝

Explanation: Corpus, callosum: hand, foot calluses. Hand foot and full of calluses. Describe the often hard work. 　　Usage: The main predicate; as predicate; with compliment, describing the hard work 　　Source: Mo Di Qin "Mozi prepared ladder": "things poultry slip cherry Mozi, three years, hand, foot and corpus callosum, swarthy face."