残油液

例句：

1. 1. The engine was left running for too long, resulting in a significant amount of residual oil.
   发动机长时间运行导致了大量剩余油。
2. 2. During the maintenance, technicians found a small amount of residual oil on the surface.
   维护期间，技术人员发现表面有少量剩余油。
3. 3. To prevent future problems, it is important to clean the engine regularly and remove any residual oil.
   为了预防未来问题，定期清洁并清除任何剩余油是非常重要的。