求翻译：it is hard to believe that this great underwater chain of mountains encircling the earth was disscovered only a few years ago是什么意思？

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it is hard to believe that this great underwater chain of mountains encircling the earth was disscovered only a few years ago

问题补充：

匿名	2013-05-23 12:21:38 很难相信这大山环绕地球的水下链，仅在几年前是disscovered

匿名	2013-05-23 12:23:18 很难相信,这一伟大的水下链包围了地球是山disscovered仅仅是几年前

匿名	2013-05-23 12:24:58 相信是坚硬的包围地球的这伟大的水下的山连是disscovered几几年只前

匿名	2013-05-23 12:26:38 很难相信山脉环绕地球的这一伟大水下链是几年前才 disscovered

匿名	2013-05-23 12:28:18 很难相信山脉环绕地球的这一伟大水下链是几年前才 disscovered

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