Very often a moderately well-off person would take his chance and try to change his life.

moderately 是副词，由形容词 moderate（中等的、适度的）加上副词后缀 -ly 构成，意思是"适度地、中等程度地"。 well-off 是形容词短语，由 well（好）和 off（离开、脱离）组成，字面意思是"脱离困境过得好"，引申为"富裕的、生活优渥的"。 moderately well-off 合起来表示"中等富裕的"，指经济状况比普通好一些但不算特别富有的状态。