1.edge : 普通用词，指较窄的边沿。
He put pink icing around the edge of the cake.
他用粉色的糖霜沿蛋糕边裱花。
They built the church on the edge of the village.
他们把教堂建在了村边。
A man was standing at the water's edge with a small boy.
一名男子带着个小男孩站在水边。
I caught (= hit) my leg on the edge of the table as I walked past.
我经过那张桌子的时候，腿磕在桌边上了。
2.margin : 指物体的空白边，一般较宽。
The plant tends to grow in the lighter margins of woodland areas.
这种植物往往生长在植被较稀疏的林地边缘。
