the frontier between A and B
between 后面接两个国家、地区或抽象领域，表示二者之间的分界。
The river forms the frontier between the two countries.
这条河构成了两国之间的边界。
边远地区；未开发地区；前沿；尖端；新领域；国家与另一国或未开发地区接壤或相对的部分；边境,边疆。；国家已开发区域边缘的荒野；某事物的最先进或最新版本；前沿。
a line or area that separates two countries
国家与另一国或未开发地区接壤或相对的部分；边境,边疆。
The part of a country which borders or faces another country or unsettled region.
国家已开发区域边缘的荒野
a wilderness at the edge of a settled area of a country
某事物的最先进或最新版本；前沿。
The most advanced or recent version of something; the leading edge.
国际边界或边界内侧(通常设防)的区域
an international boundary or the area (often fortified) immediately inside the boundary
尚未开发的研究领域；一个吸引研究和发展的主题
an undeveloped field of study; a topic inviting research and development
The new smartphone is at the frontier of mobile technology.
这款新智能手机处于移动技术的前沿。
用法提示：此句中 frontier 是名词，意为“前沿”，指最新发展领域。
AI contextual example
Medical researchers are working at the frontiers of medical science.
医学研究人员正在医学科学的前沿工作。
用法提示：frontiers 是 frontier 的复数，名词，意为“前沿”，表示医学研究的领先领域。
AI contextual example
Investors are looking for opportunities at the frontier of renewable energy.
投资者正在可再生能源的前沿寻找机会。
用法提示：frontier 为名词，此处指“新兴领域或前沿”，即可再生能源领域。
AI contextual example
between 后面接两个国家、地区或抽象领域，表示二者之间的分界。
The river forms the frontier between the two countries.
这条河构成了两国之间的边界。
表示位于边疆或边境地区，也可用 at the frontier。
Her grandparents lived on the frontier for many years.
她的祖父母在边疆生活了很多年。
常用复数 frontiers，指某学科或技术最新、最先进的领域。
Scientists are working at the frontiers of artificial intelligence.
科学家们正在人工智能的前沿领域工作。
比喻不断突破某领域已知的界限；也可说 extend 或 expand the frontiers of。
New research is pushing back the frontiers of medicine.
新的研究正在拓展医学的前沿领域。
grammar · medium
易错句子This is a very frontier research topic.
正确表达This is a very advanced research topic.
frontier 是名词，不能受 very 修饰；表示“非常前沿的”应改用形容词 advanced（或 cutting-edge）。换用形容词后，“very + 形容词 + 名词”的结构成立，语义不变。
grammar · medium
易错句子She works in the frontier of artificial intelligence.
正确表达She works at the frontier of artificial intelligence.
表示“处于某领域的最前沿”，固定搭配是 at the frontier of …，不能用 in。in 表示“在……里面”，与“前沿”义不符；改用 at 后搭配和语义都正确。
最后的边疆（最后的未探索领域）
Space is often called the final frontier.
太空常被称为最后的边疆。
新前沿；新领域
Artificial intelligence has opened a new frontier in medicine.
人工智能在医学领域开辟了一个新前沿。
边疆小镇
He grew up in a rough frontier town in the West.
他在西部一个粗犷的边疆小镇长大。
科学前沿
Her research is at the frontier of science.
她的研究处于科学前沿。
开拓精神；边疆精神
The frontier spirit still shapes American culture.
开拓精神至今仍塑造着美国文化。
拓展前沿；开拓新领域
Scientists continue to push back the frontiers of knowledge.
科学家们不断拓展知识的边界。
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