源头

例句：

1. 1. The story has a long and complex history that goes back to its source.
   这个故事有着悠久而复杂的历史，可以追溯到其起源。
2. 2. The company's success can be traced back to its founding principles.
   公司的成功可以追溯到其创立的原则。
3. 3. The problem is often traced back to human error.
   这个问题往往是由人为错误引起的。