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 Desert formation  沙漠的形成(4)
 

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 Desert formation  沙漠的形成(3)
  Four specific activities have been indentified as major contributors to the desertification processes overcultivation, overgazing firewood gathering, and overirrigation. The cultivation of crops has expanded into progressively drier regions as population densities have grown. These regions are especially likely to have periods of severe dryness, so that crop failures are common. Since the raising of most crops necessitates the prior removal of the natural vegetation, crop failures leave extensive tracts of land devoid of a plant cover and susceptible to wind and wate erosion.

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 Desert formation  沙漠的形成(2) 
  In some regions, the increase in desert areas is occurring largely as the result of a trend toward drier climatic conditions. Continued gradual global warming has produced an increase in aridity for some areas over the past few thousand years. The process may be accelerated in subsequent decades if global warming resulting from air pollution seriously increases.

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 Desert formation  沙漠的形成(1)  
  The deserts, which already occupy approximately a fourth of the Earth’s surface, have in recent decades been increasing at an alarming at an alarming pace. The expansion of desertlike conditions into areas where they did not previously exist is called desertification. It has been estimated that an additional one-fourth of the Earth’s land surface is threatened by this process.

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托福聽力測驗  政治學(Political Science)相關單字
1) constitution (N.) 憲法；章程；體格；構成；結構；構造

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 TED 每個孩子都需要一個冠軍寶座 (中文演講稿) 
演講者： Rita Pierson

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 TED 每個孩子都需要一個冠軍寶座 (4) (英文演講稿) 
演講者： Rita Pierson

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 TED 每個孩子都需要一個冠軍寶座 (3) (英文演講稿) 
演講者： Rita Pierson

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 TED 每個孩子都需要一個冠軍寶座 (2) (英文演講稿) 
演講者： Rita Pierson

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 TED 每個孩子都需要一個冠軍寶座 (1) (英文演講稿) 
演講者： Rita Pierson

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托福單字分享 基礎篇 動詞 V. (7)
 托福單字基礎篇 -動詞第七彈。

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托福聽力測驗  文學(Literature)相關單字
1) Literature (N.) 文學；（尤指有傳世價值的）文學作品； 文獻 ； （公司的）宣傳資料

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