hydrogen maser

例句：

1. 1. The hydrogen maser is a powerful tool for cutting metals.
   氢激光器是切割金属的有力工具。
2. 2. The hydrogen maser was used in the early days of space exploration.
   氢激光器在早期太空探索中被使用。
3. 3. The hydrogen maser has been proven to be more efficient than traditional cutting tools.
   氢激光器已被证明比传统切割工具更有效。