A knife should be as sharp as a razor or it mashes and bruises food rather than chopping or cutting it.

厨刀就该像剃刀那么锋利，否则你就不是在切，而是在捣浆糊。

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In its middle was a mouth with two beaks as sharp as knife blades.

在它的中间有一个嘴巴，两个啄嘴锐利得像刀片一样。

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Explain the value of a really sharp point and edge, the latter, particularly with a double edged knife, being as much to prevent the knife from being seized as for slashing.

解释真正锋利的刀尖和刀刃的价值，后者，尤其对于双刃匕首来说，可以用削划在很大程度上防止对手抓刀。

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As more and more useful, content-rich cooking information for the home chef has migrated online and into apps like "Epicurious, " tablets have become as indispensable in the kitchen as a sharp knife.

WSJ: iPad as Sous Chef

The forms of self harm recorded by hospitals included drugs overdoses, attempted hanging and deliberate injury with a sharp object such as a knife.

BBC: Self harm by children on increase