laser rod

例句：

1. 1.The laser rod is used to cut through metals.
   激光棒用于切割金属。
2. 2.The laser rod was the key to solving the puzzle.
   激光棒是解决谜题的关键。
3. 3.The laser rod was used as a tool for measuring distances.
   激光棒被用作测量距离的工具。