由于过度兴奋而混乱的人脑中都缺少多巴胺，最近的一份调查报告指出这可能是问题的主要根源。
People with hyperactivity disorder have a shortage of dopamine in their brains, which a recent study suggests may be at the root of the problem.
难营里的情况经常骇人听闻- - -过度拥挤，环境恶劣，严重缺少食物和饮用水。
Conditions in its camps are often appalling-they are overcrowded, filthy and desperately short of food and drinking water.
缺少腐殖质和过度淋滤使这种土壤对农业几乎无用。
The lack of humus and the excessive leaching make this soil almost useless for agricultural purpose.
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