Be careful—it has a sharp edge.

小心点—这刀刃很锋利。

《牛津词典》

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。

youdao

'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！”

youdao

There were also complaints that some users had experienced injuries after the fabric wore away to reveal a sharp metal edge.

BBC: Apple smart watch efforts confirmed by US patent

What gives a particularly sharp edge to the debate in this country is the claim that it is relative poverty, not absolute poverty, which has led to this deterioration.

ECONOMIST: Health

Like much of America during the Vietnam War, the real-life ballad of John and Yoko had a sharp political edge, which is brought to light in this absorbing documentary by David Leaf and John Scheinfeld.

NEWYORKER: The U.S. vs. John Lennon