heavy oil cracking

例句：

1. 1. The process of heavyoil cracking is crucial for the productionof petroleum products.
   重油裂解过程对于石油产品的生产至关重要。
2. 2. Heavy oil cracking technology has greatly improvedthe efficiency of oil extraction.
   重油裂解技术大大提高了石油提取的效率。
3. 3. The heavyoil cracking plant is a complex systemthat requires skilled operators to maintain its optimalperformance.
   重油裂化厂是一个复杂的系统，需要熟练的操作员来维护其最佳性能。