The reports received by London Zoo that a puma had been spotted forty-five miles south of London were similar in nature.
1. 句子主干：The reports were similar in nature. （主系表）
2. received by London Zoo，主语的定语。
3.that a puma had been spotted forty-five miles south of London，主语的同位语。
【翻译】伦敦动物园收到的报告说，在伦敦以南45英里处发现了一只美洲狮，这些报告在性质上是相似的。
关于“同位语从句”的翻译技巧：
因为某些被同位语修饰的名词，具有动词意义，例如 report （报告），所以它们与后面的同位语从句存在着“动宾关系”。鉴于此，当整个句子过于复杂，或者当同位语从句较长时，我们可以尝试按动宾关系翻译和处理。例如：
1. criticism his administration acted too slowly：批评/指责他的政府行动过于迟缓。
2. a kind of feeling (that) this might happen：隐约感觉到这事可能要发生。
3. his promise (that) he would always do everything：他答应他要做一切事情。
4. warning (that) teenagers should not smoke：警告青少年不该吸烟。
5. no idea (that) you were such an actor：不知道你是这样的一个演员。
