The “Twenty-four Solar terms” is the Chinese     1    (tradition)way of dividing and marking time. It shows the relationship between the universe, seasons, climate and agriculture, which is uniquely created     2    Chinese ancestors. The Twenty-four Solar Terms are important instructions for the agricultural production as well as people's daily lives. At the initial stage of agricultural development, people began to explore rules of nature and used     3    (they)to guide sowing, harvesting and other agricultural activities. Until now, it     4    (become) an essential tool to guide the agricultural production in China. And its charm and value have been increasingly recognized by the public.