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本文作者对于是否需要艾滋病疫苗、疫苗研制的困难、研制疫苗所需的知识以及何时何地可进行疫苗效力试验等问题作了回答.
The authors answer questions such as the need for an AIDS vaccine, the difficulty of developing the vaccine, the knowledge needed to develop the vaccine, and when and where it can be tested for vaccine efficacy.