They wear sharp metal blades on the bottoms of their shoes.

运动员会在鞋底安装锋利的金属刀片。

It had an economy built on creating goods such as clothing and metal blades, or knives.

它的经济建立在诸如服装制作、金属刀具等商品的基础上。

A narrow source of light is bounced off a concave mirror towards a camera, with a thin metal blade blocking some of the focused light.

窄光源从凹面镜反射到照相机，金属刀片阻挡部分聚焦光。

Wood anatomists have determined that certain surfaces of that wood must have been cut by metal blades—a Viking technology the local Indigenous people are not known to have shared.

木材结构学家判定那些木材的断面肯定是金属刀片切割的，而我们知道当地土著人没有这种维京人的技术。

I am holding a handaxe now, The Olduvai Gorge handaxe now. It doesnt, of course, look anything like a modern axe - theres no handle and theres no metal blade.

奥杜威峡谷手斧肯定外表同现代斧头是两回事，既没有手柄，也没有金属刀刃。