详细解释:n. 平原居民
英语解释：
名词 plainsman:
an inhabitant of a plains region (especially the Great Plains of North America)详细解释：
plains.man
n.（名词）An inhabitant or a settler of the plains, especially of the prairie regions of the United States.平原居民：平原上的居住者或定居者，尤指在美国的大草原地区