electron rays

例句：

1. 1.The electron ray was used to detect the presence of radiation in the area.
   电子射线被用来探测该区域的辐射存在。
2. 2.The electron ray is a powerful tool for studying the structure of matter.
   电子射线是一种强大的工具，用于研究物质的结构。
3. 3. The electron ray was used to map out the distribution of minerals in the earth's crust.
   电子射线被用来绘制地球地壳中矿物的分布图。