| English | eng-000 |
| duplex line | |
| 普通话 | cmn-000 | 双工线路 |
| 普通话 | cmn-000 | 双线 |
| 普通话 | cmn-000 | 双线路 |
| English | eng-000 | bifilar |
| English | eng-000 | double-line |
| English | eng-000 | double-track |
| English | eng-000 | doublet |
| English | eng-000 | two-wire |
| русский | rus-000 | дуплексная линия |
| русский | rus-000 | дуплексная линия связи |