在阐述柴达木盆地耕地面临的荒漠化（沙漠化和盐渍化）问题及分析其自然和人文原因的基础上，提出了耕地荒漠化防治应该坚持的基本观点以及主要技术措施。
Based on the present situation of farmland desertification and the analyzing of its natural and artificial factors, some basic ideas and main technical measures were put forward.
这里有它的历史原因：心理学家在人文想象方面发挥着巨大的作用，这种情况甚至在佛洛依德之前就开始了。
The reasons are historical: beginning even before Freud, psychologists held enormous power over the cultural imagination.
但是，人们对殖民之前非洲人文化知之甚少，很多东西还没来得及命名就随着他们的语言和信仰一起消失了，而这正是非洲岩画显得弥足珍贵的原因之一。
Yet little is known of pre-colonial African cultures. Some vanished out of history, along with their languages and beliefs, before they ever came to be named.
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