为了使得这些参考信息真实可信，传统的药物临床试验必须有所改进，以适合进行经济学评价。
In order to make this Reference information authentic, traditional clinical trials must be improved to fit to carry out economic evaluation.
当研究经济增长时，他们观察单个国家或者做跨国的宏观经济研究（有点像流行经济学家），但他们无法做像药物试验一样的经济学实验。
When studying growth, they put individual countries under the microscope or conduct cross-country macroeconomic studies (a bit like epidemiology). But they had nothing like drug trials.
试验表明：生物学产量、经济学产量、总体磷效率和磷吸收效率具有显著的品种差异。
The results showed that there were significant varietal differences in plant biomass, yield, P efficiency and P acquisition efficiency among the 8 tested soybean varieties.
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