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来源:雅诚德英语网
It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.
据估计,地球表面另外四分之一的土地正面临沙漠化威胁。
It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.
据估计,地球表面另外四分之一的土地正面临沙漠化威胁。