nonvolatile oil

例句：

1. 1. The nonvolatile nature of the substance means it cannot be altered by heat or pressure.
   这种物质的非挥发性质意味着它不能通过加热或压力改变。
2. 2.The nonvolatile component is essential for the chemical reaction to occur.
   非挥发成分对于化学反应的发生是必要的。
3. 3. The study found that some nonvolatile compounds have been found to have anticancer properties.
   研究发现，一些非挥发化合物被发现具有抗癌特性。