刀刃的英文：
knife edge
crucial point

参考例句：
  • A keen Blade
    锋利的刀刃
  • The knife Blade is wearing away.
    刀刃正受磨损。
  • The blade slashed his leg(open).
    刀刃把他的腿划(破)了.
  • He sharpened the edge of his knife on a grindstone.
    他在磨石上磨快了他的刀刃。
  • The edge of this knife is too dull to cut the bread.
    这把刀的刀刃很钝，无法切面包。
  • The blades of the swords had rusted away.
    刀刃已经生锈了。
  • Be careful of the sharp blade !
    当心这锋利的刀刃！
  • Please sharpen the edge of this knife.
    请把这刀刃磨快。
  • Good steel should be used for the making of the sword's blade;Let the best horse leap the hedge first．
    好钢使在刀刃上。
  • "Roman swords had a short, flat blade and a hilt distinct from the blade."
    罗马军刀刀刃短而平，刀柄明显区别于刀刃。
knife是什么意思：
n. 刀，匕首
v. 切；戮，刺
  • The killer stabbed him with a knife/stabbed a knife into him.
    凶手用刀刺他.
  • The knife easily cut into the cake.
    刀一下子就切进了蛋糕。
  • The intruder whipped out a knife.
    闯进来的人突然掏出一把刀来。
edge是什么意思：
n. 边，边缘；刀，刀口
v. 使徐徐移动；给...加边
  • The number of incoming edges is equal to the number of outgoing edges
    进入的线数等于离去的线数。
  • pipe edges sewing machine
    滚边缝纫机
  • Sloth turneth the edge of wit
    懒惰会磨去才智的锋芒
crucial是什么意思：
adj. 至关重要的，关键性的；严酷的，艰难的
  • Salt is a crucial ingredient in cooking.
    盐是烹调的一种重要材料。
  • The lack of clarity is especially crucial.
    缺乏透明度是关键。
  • The foreign market was increasingly crucial.
    国外市场越来越重要了。

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