| Front | frontier, verge, border, boundary, rim |
|---|---|
| Back | 这组词都有“边界”的意思，其区别是：frontier: n.边界，边境，边疆，指靠近边界(boundary)的区域；也可引申为未开发的领域，(学术的)前沿等。The American West was still a frontier a century ago.一个世纪以前美国西部还是一片边疆。She is a biochemist who works on the frontiers of biology.她是从事生物学前沿研究的生化学家。verge: n. (道路、花坛等长着草的)边缘，引申为某事即将发生之际。on the verge of war战争爆发之际border: n.较宽的边缘，边界，多指两国或两地之间的分界处附近的边缘地区、边界地带；也可以指物体的边缘等。We crossed the Mexican bordersintosthe USA.我们穿过墨西哥边界进入美国境内。boundary: n.边界；界线。多指作为界线的标识物等。The fence marks the boundary between my land and hers.这道栅栏是我的地和她的地的分界线。rim: n.边，边缘，尤指圆形或近似圆形的物体的边缘。 |
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