《史记》上说:“数始于一,终于十,成于三。“一”是数的起始,这好理解,但为何“三”为成数,“十”是终极呢?相传周文王所作的《周易》中以“一”表示天,象征天空浑然一体;以“一一”表示地,象征地面分为水域和陆地两部分。所以有“天一,地二”的说法。天地相合即为整个自然界,那么,一加二得出的“三”,也就成为一个整体的记事符号了。因此,“三”除了作为确数“3”以外,常用它来概括事物的多数。如:“三思而后行”,“三人行,必有我 “Historical Records” said: “The numbers begin at one, finally at ten, and become three. ”One“ is the beginning of the number, which is easy to understand, but why ”three“ is the number, ”ten“ is the ultimate? According to legend Zhou Wen In the ”Book of Changes“ by Wang, ”One“ means heaven and symbolizes the sky, and ”One to One“ means that the ground is divided into two parts: water area and land area. So there is a saying of ”Tianyi, Diji2“. Convergence is the entire natural world, and then the “three” derived from one plus two becomes a whole note symbol.Therefore, in addition to the “3”, the “three” is often used to sum up the majority of things. Such as: ”Think twice before going,“ ”Three people, there must be me