engineering district；maintenance of way section；track division；track district；track maintenance division  工务段

jointless line；continuously welded rail track；jointless track  无缝线路

non-NTDS track {dummy track}  非开战术系统资料追瞄

replacing and laying track with track panel  轨排换铺

track to track fusion  航迹融合

track-to-track association  航迹关联

track-to-track fusion  航迹融合

track-to-track moving time  轨至轨移动时间

transforming single track into double track  单改双线

double - track existing single track line  增建二线

belly laugh  捧腹大笑

have the last laugh  笑在最后

Laugh  笑; 乐; 嘻; 笑柄; 开颜

laugh and grow fat  心宽体胖

laugh at  嘲笑; 悝; 嗤

laugh away  笑着消磨

laugh down  用笑声打断

laugh from ear to ear  咧着嘴笑

laugh in one’s beard  偷笑