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:此原始符文极其稀珍，远胜人类研究的一般骨文，为不传之秘，可称之为宝符。
翻译:
Their primordial symbols were extremely rare and precious, far surpassing the normal bone texts that were researched by humans. Because these were secrets that could not be passed on to outsiders, they were known as precious symbols.
此原始符文极其稀珍，远胜人类研究的一般骨文，为不传之秘，可称之为宝符。