基于lbs的社交:CENTER BOLT 是什么意思？

The rock climbing skill
three fixation methods are the rock climbing essential method, the main point are: Have certain request to the bodily various spots posture and the movement.
Bodily posture: When climb rock cliff the body wants the nature to relax, by 3 pivot stable body center of gravity, but the center of gravity must along with the climb movement transformation migration, this is a key which whether the rock climbing stable, balanced, does reduce effort.
Arm movement: When artificial dike climb, requests the first knuckle effort to dig out the tight pivot at the same time, the skill must be anxious, the palm of the hand must paste on the dike, the small arm also must sag along with the palm of the hand adpressed dike, when directs the body, the finger (grasps) to have the pressure to lift the arm movement. When climbs the natural dike its movement is very big on the change, must use each forcibly method differently according to the pivot, like grasps, grasps, hangs, digs out, digs up, pinches, pulls, pushes, presses, supports and so on.
The slide skill
1) first controls the good slide, maintains a steady speed;
2) front the foot will place among the slide (to be apart from front axle bolt probably to have 5 centimeters place), after the foot will place the slide rear part upwarping place;
3) squats down, in order to make the movement which jumps;
4) with after foot fierce spot board tail, gets up the slide ball, simultaneously upwardly jumps with every effort, and brings with the front foot washboard face front;
5) in airborne curls up the body, with every effort enable the knee to approach the chest, after receives the foot, causes the board in Gao Shicheng horizontal position;
6) meets down this steady falling, the attention as far as possible falls the both feet on the slide Twinbridge bolt place, reduces to the slide flushes
7) finally the curving both legs, enable the movement to have a cushion, causes the movement to reveal has ornamental steadily.

中心螺栓center bolt