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(1) 1) 邊界(境)(boundary between countries) [C] [N(between)/(with)]：the～between the Unite States and Canada 美國和加拿大邊境;have～s with Norway and Finland與挪威和芬蘭相鄰;cross the～跨過邊境;guard the～against invasions守衛(wèi)邊境防止入侵; a town on the～一個邊境城鎮(zhèn);〖同〗 border，boundary line，limits，edge，extreme，confines，march;〖反〗interior; 2) 邊境任一側的土地(land on the border) [C] [作attrib]：a～zone/town 邊境地帶/城鎮(zhèn);～disputes/incidents/justice邊境爭端/事件/司法;～guards邊防戰(zhàn)士;

(2) 邊境(邊遠)地區(qū)(land that forms the furthest extent of a country's settled or inhabited regions) [C，the～] (尤AmE)：beyond/near/on the～越過已開發(fā)地區(qū)/靠近邊遠地區(qū)/在邊遠地區(qū);settle the～定居邊疆;〖同〗outskirts;territories;〖反〗interior;

(3) (尤指知識)尖端(the limits or boundaries of knowledge，etc) [pl]：at the～of space exploration在太空探索的尖端知識方面;beyond the～of knowledge超過了尖端知識的范疇;advance/explore the～s of science 推進/探索科學的最新發(fā)展;The～s of medicine are moving all the time. 醫(yī)學的尖端技術一直在向前發(fā)展。

→ fron′tiersman n 邊疆居民;拓荒的人;

【辨異】frontier與border和boundary的區(qū)別見BORDER。