分梳罗拉针布上的针齿损坏或变钝。
悲观会让你成功需要的工具变钝。
这刀刃已变钝了。
由于模具和冲模会变钝，需要不断更新，这也造成了成本上升。
The need to keep replacing the stamps and dies used by the press, as they become blunt, also adds to the expense.
例如，如果某刀片变钝，不能正确地切除管筒的末端，密封的边线就会很粗糙。
For example, if a knife becomes blunt and can no longer cut off the ends of the tubes correctly, the seal will be left with rough edges.
但是，它们的口器可能更令人望而生畏——毫不夸张地说，海胆的牙齿可以把岩石咬碎，却永远不会变钝。
But their mouths may be even more daunting-urchin teeth can literally chew through stone without getting dull.
并且放在浴室的潮湿刀片上藏匿着旧头发和死皮，使用剃刀的时候会导致毛发内生，引发刺激性反应，因为刀片变钝了。
And a moist blade kept in the shower, harbouring old hair and dead skin, can lead to ingrown hairs and irritation when shaving because the blade becomes blunt.
也许关于海胆，人们知道得最多的是它们的棘刺盔甲。但是，它们的口器可能更令人望而生畏——毫不夸张地说，海胆的牙齿可以把岩石咬碎，却永远不会变钝。
Sea urchins are perhaps best known for their armor of spines. But their mouths may be even more daunting-urchin teeth can literally chew through stone without getting dull.
也许关于海胆，人们知道得最多的是它们的棘刺盔甲。但是，它们的口器可能更令人望而生畏——毫不夸张地说，海胆的牙齿可以把岩石咬碎，却永远不会变钝。
Sea urchins are perhaps best known for their armor of spines. But their mouths may be even more daunting-urchin teeth can literally chew through stone without getting dull.
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