4、Learning from the perseverance of the ancients to wear through the inkstone is a good way to realize their parents'desire to have their children grow up as soon as possible.
3、Many people will have doubt, these people also has the obvious spinal problem, what also can wear through better carry on the back to correct posture?
5、There are at least two reasons why droplets can wear through stones: one is that they are dedicated to each other, each droplet falling in the same direction, on a fixed point, and the other is that they persevere, and they have never ceased to make such efforts over the long years.
2、This proven system negates the need for gear replacement if the strut bottoms should ever wear through.
1、We allow for wear through friction in designing the parts of every machine.
