卫生服务的预备性研究 Health Service Preparatory Studies
先进行“预备性研究”，以挑选“实证性研究”的发球示范者。
Do the "pilot study" first to select a ball server of the "practical research".
而详细的研究是建立在上个月发表的一项预备性研究的基础上，由包括大学和世界野生生物基金会在内的10个机构共同进行的。
The detailed study, which was conducted by 10 institutions including universities and the World Wildlife Fund, was built on a preparatory study published last month.
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