Be careful—it has a sharp edge.
小心点—这刀刃很锋利。
But natural selection swings a sharp edge, and the teen's sloppier moments can bring unbearable consequences.
但是，自然选择是把双刃剑，青少年的草率会带来令人无法承受的后果。
'it's a very clean cut,' said the Rat, examining it again attentively. 'That was never done by a branch or a stump. Looks as if it was made by a sharp edge of something in metal. Funny!'
“伤口很整齐，”河鼠再一次仔细检查他的腿。“绝不会是树枝或树桩划破的。看起来倒像是被什么锋利的金属家伙划的。怪事！”
这把斧头的刃口锋利。
Meg:You must have caught it on a sharp edge.
美格：一定是给什么尖锐的东西刺到弄破了。
If something has been going on for billions of years, you wouldn't expect a sharp edge.
如果什么东西是存在了亿万年的，那么你就不用期待一个明显的边界。
Using pliers or a pipe wrench to tighten a bolt or nut. This may scar the bolt head or nut creating a sharp edge.
使用钳子或管扳手拧紧螺栓或螺帽。这样可能会刮伤螺栓头或螺帽，从而形成尖锐的边缘。
Keeping a sharp edge on chisels and plane irons is absolutely necessary for the successful and safe use of these tools.
为了使凿刀和刨子好用且安全，必须保证他们的刃足够锋利。
Keeping a sharp edge on chisels and plane irons is absolutely necessary for the successful and safe use of these tools.
为了使凿刀和刨子好用且安全，必须保证他们的刃足够锋利。
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