By applying this principal to the knife you can see that with a keener edge there's a greater concentration of the pressure on the edge, so it takes much less force to make the knife cut.

将这一原理运用在刀上，你能看到，在锋利的刀刃上，压力能更好的聚集，因此切割起来更省力。

youdao

By applying this principal to the knife you can see that with a keener edge there's a greater concentration of the pressure on the edge, so it takes much less force to make the knife cut.

将这一原理运用在刀上，你能看到，在锋利的刀刃上，压力能更好的聚集，因此切割起来更省力。

youdao