Fossil charcoals tell us that wildfires have been part of life on Earth for as long as there have been plants on land. That's m ore than 400 million years of fire.
wildfires have been part of life on Earth for long. 很久以来山火就一直是地球上生命的一部分。其存在的时间长度和地球上有植物的时间长度是相同的。通俗的说就是,自从地球上有了植物(生命),山火就是地球生命的一部分。for long 被as...as...比较结构修饰,表示二者存在的时间一样长。