tracking research

• 跟踪调查

tracking research的用法和样例：

例句

1. One pollster, SurveyUSA, has been tracking early voters in states that permit voting before election day.
   调查美国这家民意调查机构一直在跟踪调查那些居住在大选日前被准许提前投票州的早期民意调查投票者们。