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。
U. S. to develop technology and processes to ensure that the saw blade and other cutting instrument was the most sharp edge.
我们的开发技术和工艺保证了锯片和其它切削工具获得了最锋利的刃口。
They look like chipped cobbles, and they were made simply by taking one large piece of stone and striking it with another, chipping off a few bits to make at least one sharp cutting edge.
它们外表看来就像一颗颗稍稍锤击过的鹅卵石，而且它们制作简单，通常就是拿两颗石头互相锤击，至少把一端锤打出一个尖锐的边缘出来。
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