单轨的

例句：

1. 1. The train travels on a single track.
   火车沿着一条单轨行驶。
2. 2. The engineer was responsible for maintaining the single track.
   工程师负责维护这条单轨。
3. 3. The construction of the new railway line will be completed in two years.
   新铁路线的建设将在两年内完成。