change oil

例句：

1. 1. The car needsto be changed oil before it can startagain.
   这辆车需要换油才能再次启动。
2. 2. The mechanic changed the oil and checkedthe engine.
   机械师更换了机油并检查了引擎。
3. 3. We need to change theoil regularly to keep the engine running smoothly.
   我们需要定期更换机油，以保持引擎平稳运行。