| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | canal system | China | Extensive canal system historically used for transportation and irrigation | 1 |
| 2 | canals | China | Historically important for irrigation and agriculture | 1 |
| 3 | root canal treatment | China | Root canal treatment may be viewed as a less common procedure and may not be the first choice to save a tooth. | 1 |