This early comparison of tropical and temperate butterfly richness has been well confirmed.如何翻译

Question

This early comparison of tropical and temperate butterfly richness has been well confirmed.是2000年TOEFL阅读中的一句话，应该怎么翻译，最好具体点，谢谢。

Answer 1

For example, in 1875 one biologist pointed out the diversity of butterflies in the Amazon when
he mentioned that about 700 species were found within an hour's walk, whereas the total
(10) number found on the British islands did not exceed 66, and the whole of Europe supported only 321. This early comparison of tropical and temperate butterfly richness has been well confirmed.
Amazon 热带 700 species
British islands 温带 <66
the whole of Europe 温带 321
看上下文就知道了 butterfly richness 蝴蝶物种丰富度/多样性
这种早期的关于热带和温带蝴蝶物种丰富度的比较已经得到很好的证实
望采纳！

Answer 2

这种早期比较丰富的热带和温带蝴蝶已被证实

Answer 3

热带蝴蝶和温带蝴蝶之间早期的明显对比已经很好地证实了。