loop-line

n railway or telegraph line that leaves the main line and then joins it again （铁路的）会车线; （电信的）回线, 环形线路.

look through, look through sb, look to, look up, look up to, look up to sb., look upon...as..., look-alike, look-in, look-out, look-over, look-through, looker, looker-on, looking-glass, lookout, loom, loony, loony-bin, loop, loophole, loopy, loose, loose box, loose covers, loose-, loose-leaf, loosely, loosen, looseness, loot, lop, lop-eared, lope, lopsided, loquacious, loquaciously, loquaciousness, loquacity, loquacity, loquat,