Explanation: All day long, day and night Usage: Joint type; for adverbial; that continued day and night Source: Du Pengcheng "In the days of peace," the first chapter: "Chengri Chengye explosions continued, as though engaged in a war determined the destiny of mankind."
Day and night, day and night
Day and night, day and night. Du Pengcheng, "the days of peace," the first chapter: "Chengri not stop blasting sound continuously, as if making a decision here, the fate of the war of mankind."