The notion is that people have failed to detect the massive changes which have happened in the ocean because they have been looking back only a relatively short time into the past.
这种观点认为，人们之所以没有察觉到海洋中发生的巨大变化，是因为他们用于回顾过去的时间相对较短。
2
Such changes are all but invisible over the short time scale of modern observations, and, it is argued, they are usually obscured by innumerable gaps in the imperfect fossil record.