在地球化学领域中，直接解决沉积层序和早期成岩时代的定年问题长期以来被证明是具有挑战性的问题之一。
In the field of isotopic geochemistry, direct dating of sedimentary sequences and early-stage diagenesis has long been proved to be one of the challenging problems.
了解这些具有挑战性的时代是进化的动力变化，正所带来的这种转变，因为预言的玛雅和许多其他文化几千年前。
Find out how these challenging times are part of the evolutionary impetus for change that is being brought on by this shift, as prophesied by the Maya and many other cultures thousands of years ago.
了解这些具有挑战性的时代是进化的动力变化，正所带来的这种转变，因为预言的玛雅和许多其他文化几千年前。
Find out how these challenging times are part of the evolutionary impetus for change that is being brought on by this shift, as prophesied by the Maya and many other cultures thousands of years ago.
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