risk of contamination

例句：

1. 1.The factory's wastewater is a major source of contamination in the area.
   该工厂的废水是该地区的主要污染源。
2. 2. Contamination from chemicals can have serious health effects.
   化学物质引起的污染可能对健康造成严重危害。
3. 3. The government has implemented strict measures to prevent contamination of water sources.
   政府已实施严格措施，以防止水源受到污染。