edges of the raster

例句：

1. 1. The book has many interestingedges.
   这本书有很多有趣的边缘。
2. 2. Thecar's wheels havesharp edges that can be dangerous.
   汽车的轮子有锋利的边缘，可能会很危险。
3. 3. The table has asmooth edge that makes it easy to clean.
   桌子有一个光滑的边缘，这使得它很容易清洁。