介绍了改造中使用到的先进工艺技术和施工技术，并对改造后的效果效益进行了评价。
Advanced process and techniques used in the reconstruction are introduced, and the results of the reconstruction are evaluated as well.
毕竟，相比其它发达国家，美国的医疗支出大得多，但效果并不理想。因此我们应该能够提升医疗体系的成本效益。
After all, America spends far more on health care than other advanced countries, without better results, so we should be able to make our system more cost-efficient.
其他研究人员称，不可能对此类工程学提案进行成本效益分析，因其潜在的负面效果是不确定——而且严重的。
Other researchers say that it is impossible to do a cost-benefit analysis of these engineering proposals because the potential downside is so uncertain - and large.
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