英语翻译As we have seen,similar destructive phases,if notas intense,have occurred in the past in more limited areas of the Earth.

英语翻译As we have seen,similar destructive phases,if notas intense,have occurred in the past in more limited areas of the Earth.
英语翻译
As we have seen,similar destructive phases,if not
as intense,have occurred in the past in more limited areas of the Earth.

英语翻译As we have seen,similar destructive phases,if notas intense,have occurred in the past in more limited areas of the Earth.
我们能够发现,类似的灾难时期（如果不一定这么严重的话）过去在地球上更多的地区发生过.
if not as intense 是个省略句,补全是：if it it not as intense as this(this 应该是指你当前说的这个灾难)

正如我们所见到的，相似的不太严重的灾难时期，在地球的局部地区发生过。

众所周知，相似的灾难时期，如果不是很严重，在地球的局部的地区出现过
这前面和后面还有
你没有写完，所以翻译不好翻译
希望可以帮到你