How to say this is definitely there, but it is reflected in "prevention". If we want to say fundamentally, its roots are still on the air pressure rod. The slogan of fire prevention is "fire safety, prevention first". If used here, "pre" is embodied in the safety inspection and certification of pneumatic rods, and "prevention" is embodied in an extra layer of protection. So when buying a computer chair, if that's what you're thinking, my personal advice is not to be seen together. The following are the things I pay more attention to when buying GAVEE.