| a long distance running or race | long-distance | marathon |
| middle and long distance race | dx arm | dx transference |
| dx correspondence | dx transport | dx Card Reader |
| Ultra long haul away optic cable | trilateration | dx Dependancy |
| dx band conveyor | Ji'en Dx Spy model | Dx amative solitude |
| Dx Obtrude Spy Fuzuoxingjin | Dx bull Melody water engineering circulate regulate experiment | dx Melody water engineering management information system, MIS |
| Ultra long haul Liguang Transmission technology ground very appliance | |