Doing anything is more difficult than on Earth, so how to go to the toilet in zero gravity

In space, water cannot flow, so the toilets in the spacecraft are all exhaust toilets, and the urine and urine are taken away by the air current. When astronauts go to the toilet, they must tie their horses well, and their buttocks should be tightly pressed against the toilet holes, so that the toilet bowl can be completely sealed before they can urinate and urinate. After urinating and defecating, the stool is sucked away by the air flow and put into a special collection bag, and the urine will enter the instrument for disinfection and purification, and then converted into drinking water, domestic water and work water for astronauts.