求翻译：承载性，车架第一横梁采用圆管梁设计，减小应力集中，提升抗扭强度30%，副车架采用重卡X型横梁，贯通式平衡梁、卷边副梁等，承载性提高20%以上，标配铸钢后桥，加宽型刹车蹄片、轮辋，制动更强、散热更佳，承载更好；是什么意思？

Bearer, the first beams frame tube beam design to reduce stress concentration, enhance the torsional strength of 30%, x-type subframe with heavy truck beams through balance beam, curling Vice beam carrying increased 20 %, standard cast steel rear axle, the widen the type of brake shoe, wheel rim, br