No one knows for certain what happened, but it's a fair bet that it was not an accident.
没有人知道究竟发生了什么,但几乎可以肯定这并非意外。
He used to sleep during the day and work at night, quite unaware of the fact that he had become the ghost of Endley.
白天睡觉,夜里出来干活,一点不知道自己已成了恩得利家场的活鬼。