1. the exercise of balance car is called puzzle exercise in the medical field. through the movement of the whole body muscles, the body is in an active and relaxed s...

the earliest skates were in 1100 ad, when bones were mounted on the soles of long boots to help hunters hunt in winter. the first pair of skates was created explosiv...

on the way home from work, you can see a few young men and women wearing skates speeding down the road. im talking and laughing, especially happy, so i thought wheth...

the bearings of skates can be decomposed into inner ring, outer ring, cage, steel ball, and dust piece. the quality of the bearing can also be viewed from these aspe...

research on the forward (backward) principle of twisted car1, research motivationone day, i saw the two-year-old son of the teacher playing a twist-and-twist car. th...