an ordinary person without special training who does scientific work, for example collecting information in order to help scientists

You can become a citizen scientist and help track climate change. 你可以成为一名民间科学家，帮助追踪气候变化。

A citizen scientist might report a bird that normally doesn't live in a region. 民间科学家可能会报告在某个地区发现了一只通常不在那里生活的鸟儿。