broad-footed rail

例句：

1. 1. The railwayline is wide enough for two trainsto pass each other.
   这条铁路线足够宽，可以同时让两列火车通过。
2. 2. The engineer had to replace the old, narrow-footed rail with widerones.
   工程师不得不用更宽的铁轨替换旧的窄铁轨。
3. 3. Thenew railway was built with a broad-footed rail system to improve efficiency.
   新铁路采用了宽脚铁轨系统以提高效率。