【答案解析】As teachers or researchers, once we have decided on our own research topics, the next step is to investigate or watch what we need to study. In this process, we can acquire some data. The data that haven't been sorted out are all raw data. They are our precious first- hand information to get a deep understanding of things and the internal connections between them. These data are seemingly irregular as well as disorderly. But if we sort them out, we can identify some regular things.