synthetic ester lubricant

例句：

1. 1. This newlubricant is much more effectivethan the old one.
   这种新的润滑油比旧的更有效。
2. 2. The machine needs to belubricated regularly to ensure smoothoperation.
   这台机器需要定期润滑，以保证顺畅运行。
3. 3. The engineer used a specialsynthetic ester lubricant tomake the gears work smoothly.
   工程师使用了一种特殊的合成酯润滑油使齿轮运转顺畅。