to push (back) the frontiers
01
to expand the boundaries or limits of knowledge, discovery, or understanding, typically in science, technology, or exploration
例子
Scientists continuously strive to push back the frontiers of medical research.
02
to extend the boundaries of a region or country, often through exploration, colonization, or territorial conquest
搭配
例子
European explorers pushed back the frontiers of the known world by discovering new continents.
