Tonight's knife-edge vote could be uncomfortably close.
今晚的投票难以预料，结果可能会很接近，真令人紧张。
The edge is as blunt as an old butter knife.
刃钝得跟一把老黄油刀一样。
Tom keeps a knife with a keen edge.
汤姆有一把锋利的小刀。
The edge of the knife is turned.
刀卷口了。
I blunted the edge of the knife yesterday.
昨天我把刀刃弄钝了。
The purpose of the cutting edge of a knife is to concentrate the force that's being applied at the handle.
刀刃的作用就是把人们用在刀把上的力集中起来。
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。
If you cut the iron wire with a knife, you'll blunt its edge.
如果你用刀砍铁丝，会使刀锋变钝的。
Be careful with that knife. It's got a keen edge.
小心那把刀子，它的刀刃很锋利。
刀子边很锋利。
He quickly took out his knife and made a mark on the edge of the boat.
他匆忙拿出一把小刀在船边上做了一个记号。
If you try to cut stone with a knife, you will blunt the edge.
如果你试以刀砍石，你就会把刀刃弄钝。
If you try to cut stone with a knife, you will blunt the edge.
如果你试以刀砍石，你就会把刀刃弄钝。
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