It is difficult to avoid the aging of phosphate ester fire-resistant oilinservice. By-pass regeneration maintenance is the key step to extend oil life and safe operation.
磷酸酯抗燃油运行中难免老化、劣化，正确的旁路再生维护是延长油的使用寿命，保证油正常运行的关键。
2
Roughly five and a half million foreign workers play an important role in the Saudi economy, for example, in the oil and service sectors.
大约由550万名外籍工作者在沙特经济中起了重要的作用，例如，在石油和服务部门中。
3
Aside from operating two venture capital funds, he chairs of CHC Helicopter Corp., which provides service to the oil and gas industry in more than 30 countries.