1. The key pollution indicators are ammonia nitrogen, petroleum, potassium permanganate index and volatile phenol. The key pollutant in 77.7% of the sections of Grade V and worse than Grade V is ammonia nitrogen. 
   主要污染指标为氨氮、石油类、高锰酸盐指数、挥发酚，77.7%的ⅴ类、劣ⅴ类水质断面首要污染物是氨氮。
2. The quality of the water from Beijing to Tianjin is worse than Grade V. The key pollution indicators are ammonia nitrogen, petroleum, potassium permanganate index and volatile phenol. 
   北京入天津境内水质为劣ⅴ类。主要污染指标是氨氮、石油类、高锰酸盐指数、挥发酚。
3. volatile oils; volatile solvents. 
   挥发性油；挥发性溶剂。
4. volatile stocks; volatile emotions. 
   变化大的股票；易变的情绪。
5. In a volatile mood. 
   轻快的心情

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