knife's edge

Water's Edge 歌词 water's edge Where's the knife? edge this knife is jim's. 英语翻译on a knife-edge 是在刀刃上得意思吧? I have two (knife).knife要带s吗 sharpen one's competitive edge by doing knife It,s a knife 变为复数形式 that knife looks beautiful,it is s------- It's a knife 变为复数形式