I'm sure you must be asking yourselves what makes developing countries, especially those in sub-Saharan Africa, so attractive for these HIV clinical trials?
我肯定你一定会问 什么驱使这些发展中国家 特别是那些位于非洲撒哈拉沙漠的国家 被吸引去参与这些艾滋病临床实验？