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|---|---|---|---|---|---|
| 1 | closed conduit | 暗渠 | |||
| 2 | covered conduit | 暗渠 | |||
| 3 | culvert | 暗渠 | |||
| 4 | culvert under drain | 暗渠 | |||
| 5 | closed concrete conduit | コンクリート暗渠 | |||
| 6 | concrete culvert | コンクリート暗渠 | |||
| 7 | gravel trench | 暗渠排水 | |||
|
|
|
|
|
|
|---|---|---|---|---|---|
| 1 | closed conduit | 暗渠 | |||
| 2 | covered conduit | 暗渠 | |||
| 3 | culvert | 暗渠 | |||
| 4 | culvert under drain | 暗渠 | |||
| 5 | closed concrete conduit | コンクリート暗渠 | |||
| 6 | concrete culvert | コンクリート暗渠 | |||
| 7 | gravel trench | 暗渠排水 | |||
 
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