Indeed, it has been calculated that the work being done to expand vaccine coverage in developing countries by my organization, the GAVI Alliance, should yield an 18% return on investment by 2020. But now, as more evidence is gathered, it looks likely that even this may not do justice to the full value of vaccines.
事实上，据计算，到2020年，我的组织——GAVI联盟在扩大发展中国家疫苗覆盖方面的工作应该能够产生18%的投资回报。但随着更多证据的收集，现在看来这也不足以概括疫苗的完全价值。