What exactly does a car with four beams and eight pillars mean?

Four beams: A-pillar, B-pillar, C-pillar and D-pillar transverse and longitudinal beams &; The anti-collision structure of roller skating car can be summarized as: four beams and six columns, four beams and eight columns! -Anti-collision beams are cross beams and longitudinal beams respectively, but "four beams" refer to the longitudinal beams at the front, back and both sides, and the anti-collision beams mainly play a protective role in low-speed collision. Generally, the anti-collision beam of double-layer rolling arch structure can withstand mild impact to ensure no deformation, and knowledge plays a role in buffering and conducting in severe impact. Hope to adopt, thank you!