sharp edge

基本解释

It's double-sided, it has a sharp edge both sides, and it's symmetrical.
它有双面，两侧边缘都很锋利，而且相当对称。
Cuts can become infected if a person uses nonsterile or dirty cutting instruments — razors, scissors, pins, or even the sharp edge of the tab on a can of soda.
如果一个人使用未经消毒或肮脏的切割工具——剃刀、剪刀、别针，甚至是一听汽水标签的尖锐边缘，切割可能会导致感染。
One, two, three ... three times at the other ... so eight specific actions by him, knocking it with another stone, to take off a flake, and to leave this almost straight line, which is a sharp edge.
所以他不多不少恰恰打了八次，利用其他石头来打磨它，敲掉一小薄片，留下这边面几乎呈现直线，边缘相当之锋利。

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
Every sharp edge and hairpin turn was nicely enunciated.
NPR: Opening Day With The Escher String Quartet
David put some sausages to cook under the grill, opened tins of baked beans, cut his hand on the sharp edge of one of them, and leaked surprisingly thin wet blood onto the bread.
NEWYORKER: The Swan