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。
'The shop was an old converted house with many large, disused fireplaces and tall, narrow chimneys.
”那是一座老式的、经过改造的房子,店里有许多废置不用的大壁炉和又高又窄的烟囱。