Adjacent narrow veins的用法和样例：
- In translation phase 6 (2.1), adjacent narrow string literals are concatenated and adjacent wide string literals are concatenated.
- Alteration mylonite gold deposit, which is steeply dipping and narrow vein together.
- In raining industry developed countries mining mechanization in narrow vein mines was introduced widespreadly.
- The underhand slice stoping method, with reinforced concrete for roof support, is recommended to mine narrow veins where the mining technological conditions are very complicated.