span centre meaning in Chinese

跨距中点
跨中

6 maximum span centre to supports of psb shall be 60 . 96mm ( 200 ’ - 0 ” )
钢架桥最大跨度中心到支柱的距离是6090毫米（ 200英尺）。
2 . the relation between stress ratio and span centre deflection is linear , and when the stress ratio is large , the increase of mid - span deflection by cycle index is small . the smaller the stress ratio is , the larger the increase of span centre deflection by cycle index is
( 2 )应力比对跨中挠度的影响呈线形关系,且应力比较大时,跨中挠度随循环次数的增长相对较小;应力比较小时,跨中挠度随循环次数的增长相对较大。