Books offer an outstanding wealth of learning at a much cheaper price than taking a course.
书籍能提供非常丰富的知识，而且价格比上一门课要便宜得多。
On one hand, they have a wealth of information at their analytic disposal; on the other, that wealth incurs the cost of learning to cope with the sheer volume.
一方面，有丰富的信息可供分析利用。而另一方面，如此丰富的数据带来了学习与研究庞大数据量的成本。
They provide education a wealth of teaching resources and learning resources to enable the learning of network environment to become a reality.
它为教育提供了丰富的教学资源和学习资源，使网络环境下的学习成为现实。
They provide education a wealth of teaching resources and learning resources to enable the learning of network environment to become a reality.
它为教育提供了丰富的教学资源和学习资源，使网络环境下的学习成为现实。
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