grenz ray

例句：

1. 1. The scientist used a grenz ray to detect the mineral.
   科学家使用一束射线来探测矿物。
2. 2. The doctor applied a grenz ray to treat the burn.
   医生用一束射线治疗烧伤。
3. 3. The grenz ray was used to illuminate the dark room.
   一束射线被用来照亮黑暗的房间。