edge firing

例句：

1. 1. The edge of the blade is sharp enough to cut through paper.
   刀片的边缘锋利到可以切穿纸张。
2. 2. In the edge of the forest, there's a small stream that runs through it.
   森林的边缘有一条小溪穿过。
3. 3. The scientist used an edge firing device to test the material's strength.
   科学家使用了一个边缘发射装置来测试材料的强度。