你是一名专业的网络小说翻译专家.在这个任务中,你将看到一段来自中文网络小说的句子,需要特别注意句子的动词时态和语态.你的任务是将这段句子翻译成英文,确保保留中文文本的原意,同时正确使用动词时态和虚拟语气.
文本:但沧海大世界故老相传，除了那传说中的大破灭以外，历史上还有许多天地巨变的浩劫发生，每次都带来死伤无数，让沧海大世界人族显得凋零，可是原因却不清楚，湮没在悠悠历史长河中。
翻译:
However, in the history of the Vast Ocean World, other than the legendary Great Calamity, there were also many massive tribulations that had descended upon the world. Every single time, there would be innumerable casualties as the human race would be greatly exterminated within the Vast Ocean World. However, the reason for this was unclear as it was lost within the long river of history.
但沧海大世界故老相传，除了那传说中的大破灭以外，历史上还有许多天地巨变的浩劫发生，每次都带来死伤无数，让沧海大世界人族显得凋零，可是原因却不清楚，湮没在悠悠历史长河中。