He sat down on a bench, hitching up his trousers, carefully, as if afraid of destroying a knife-edged crease.

他坐到一条凳子上，小心地拉起裤子，好象怕把笔挺的。

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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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He sat down on a chair, hitching up his trousers carefully, as if afraid of destroying the knife - edged crease.

他在一把椅子上坐了下来，小心翼翼地把裤管稍稍拉起，似乎怕弄皱那刀刃般的折缝。

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Iran's Supreme Leader Ayatollah Ali Khamenei has called the Internet a threat to national security and a dangerous double-edged knife that has benefits as well as risks.

WSJ: Cyberattack Hits Iranian PCs

As Wilson tells the story, the Cardinal became so agitated one night, observing a dinner guest pick his teeth with the double-edged knife still in use, that he ordered blunt knives for his household.

NEWYORKER: A Fork of One��s Own

It was the tou the wide, well-honed, flat-edged whacker of a knife that Chinese cooks used for everything from butchering to dicing and fine slicing and the chopstick, which, in the Song era, came into common use.

NEWYORKER: A Fork of One��s Own