full closed crankcase ventilating system

例句：

1. 1. Thenew car has a full closed crankcase ventilating system to improve fuel efficiency.
   这款新车配备了全封闭曲轴箱通风系统，以提升燃油效率。
2. 2.The old car had a simple air intake system that was not as effective as the new one.
   旧车有一个简单的进气系统，效果不如新系统好。
3. 3.The engineers worked hard to upgrade the air intake system of the old car to meet the new standards.
   工程师们努力工作，升级了旧车的进气系统，以满足新的标准。