大单小单大双小双怎么看简介：For ordinary practitioners, this is something they should do before exercising. If you are not familiar with your own meridians and just keep your head down and run the heaven and earth, it is no different from committing suicide.
For ordinary practitioners, this is something they should do before exercising. If you are not familiar with your own meridians and just keep your head down and run the heaven and earth, it is no different from committing suicide.
