线路交换集中器

in-line filter

toe the line

line focus tube

built-in smokemeter【环境】;in-line smokemeter【环境】

queu(e)ing theory【数】;theory of queu(e)ing【数】;waiting line theory【数】

manifolding apparatus with means for line selection

junctor【电】[专业]运输系统之间的\ntie line【交】

in-line blending