edge

n.

1. 边，棱；边缘[C][U]
   They lived in a house on the edge of a forest.

   他们住在森林边缘一所房子里。

2. 刃，刀口[C]
   He sharpened the edge of his knife on a grindstone.

   他在磨石上磨快了他的刀刃。

3. 优势；优越条件[S]
   The Democrats hold the edge in the Senate.

   民主党人在参议院中占优势。

4. （言语等）尖锐；敏锐；激烈[S1]
   His remark has a biting edge to it.

   他的话非常尖锐辛辣。