最近自然杂志上的一片文章称这可能要归咎于密西西比河的侵蚀作用。
A new paper in the journal Nature suggests the river's erosive action may be to blame.
如何评价黄土高原自然侵蚀与人为加速侵蚀作用 ，恢复与重建植被的可能性和必要性等是近年来治理黄河的热点问题。
There have been many arguments on how to evaluate the natural erosion and man_made accelerated erosion, the possibility to recover and rebuild vegetation on loess plateau.
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