日旰忘食

Explanation: Still too busy to think it was already late for dinner. Describe the dedicated, hard-working hard. 　　Source: "After the mass on the Han Rulin Yin Min," Goodwill and Ban Biao, every encounter, Noir at sun_set_ forgot to eat, Yefen not sleep. " 　　Examples: Seeking clothes the emperor is unknown, ~, still afraid million machine to ignore, the world is owned stagnation. ★ "Zhou Shu Yun Le Biography" Thesaurus:  On sunset (literally) to fortget one's meals--dedication