After sending investigators to the scene we can now confirm that it was the result of an accidental fire.
在派出调查人员到现场后,我们现在可以确定事故是由意外失火导致的。
The killing of the bison changed the whole wildlife of the plains. With fewer bison, grass shoots were not eaten, so grass did not grow as strongly.
屠宰野牛改变了平原的全部野生生物。野牛少了,嫩草没有牛来吃了,草就长得不粗壮。