In order to protect his teeth against dental decay (erosion), sandy' mother declared to prohibit excessive sweet diets and desserts.

为了防止牙齿被蛀蚀，桑迪的妈妈声明，禁止他过度地吃甜食和饭后甜点。

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First, erosion resulting from excessive deforestation in the upper reaches of the river. And second, heavy silting which raised the riverbed in the main channel.

第一，过度砍伐引起的河流上游的侵蚀，第二，严重的泥沙淤积抬高了主干道的河床。

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The aeolian desertification is a land degradation characterized by wind erosion mainly resulted from the excessive human activities in arid, semiarid and part of sub-humid regions in Northern Chian.

沙漠化是干旱、半干旱及部分半湿润地区由于人地关系不相协调所造成的以风沙活动为主要标志的土地退化。

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