1、A few years ago, the old bridge was unbuild due to safety concerns.
几年前，由于安全原因，这座旧桥被拆除了。
2、The architect's plan was to unbuild the existing structure and create a new, modern building in its place.
建筑师的计划是拆除现有建筑，然后在原址上建造一座新的现代化建筑。