engine conditioning

例句：

1. 1. The engineersspent hours adjusting the engine to improveefficiency.
   工程师们花了数小时调整发动机以提高效率。
2. 2. The car's performance wasgreatly improved by the engineer's carefulconditioning of the engine.
   经过工程师仔细调校，这辆车的性能得到了极大的提升。
3. 3.Engineers are responsible for ensuring that allcomponents are properly conditioned before the vehicleis put into service.
   工程师负责确保所有部件在车辆投入使用前都经过适当调校。