小心那个打开的罐头——它的边缘很锋利。

Careful with that open tin - it's got a very sharp ___edge.

我在下公共汽车时，手被一个锋利边缘划伤了。

I cut my hand on a sharp ___edge while getting off the bus.

厨师在准备鱼之前，把他最喜欢的刀的刀刃磨锋利了。

The chef sharpened the ___edge of his favourite knife before preparing the fish.