跨中正弯矩区钢箱内上部 浇筑混凝土，可解决钢箱梁顶部混凝土受压面积不足的问题；
Concrete is poured on the upper part inside the steel box in the span-center bending moment area to solve the problem of the insufficient pressing area of concrete on the top of the steel box girder;
空气弹簧是利用其内部压缩空气所产生的反力、随其变形而引起的有效受压面积增加所产生的反力、或两者合力抵御外力的一种弹性机构。
Air spring is a elastic mechanism that using the reactive force of compressing air, reactive force of raising effective area for the deformation and the resultant of above two forces.
比如，帕斯卡是用来测量某处面积所受压力的单位。
PASCALS, for example, measure the pressure applied to a certain area.
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