| 沟 |
gōu tōng | to join; to connect; to link up / to communicate |
| 沟 |
gōu | ditch / gutter / groove / gully / ravine / CL:道 |
| 通 |
tōng | to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc |
| 通 |
tòng | classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc) |