That too means less propylene, since it is also a by-product of petrol production.
既然丙烯也是石油工业产品的副产物，这也意味着其产量缩水。
2
Some companies, it says, excuse themselves by claiming their product is simply a by-product of palm oil production - and oil is increasingly being certified.
报告说到，一些公司通过宣称自己的产品只是一种棕榈油的副产品而为自己找借口-而油正加速被认证。
3
No oil, means that there is no risk, no pollution, no damage to the risk of product or product safety risk caused by not, no production loss.