n.边界；边境；尖端；边缘
We were turned back at the frontier. 我们在边界那儿被赶了回来。
Everything is quiet on the frontier. 边境上一切安静。
This new frontier incident probably means war. 这个新的边境事件可能导致战争。
The minority of us are confronted with difficulty in the frontier of the major. 我们少数人在该专业尖端领域面临困难。
The frontiers of medical knowledge are being pushed forwards as time goes on. 医学知识的新领域正随着时间向前推进。
He came from the remote frontier. 他来自遥远的边疆。
n. (靠近未开发地带的)边远的居民； 边远者
adj.在国境外生活的
