stress free rail temperature

例句：

1. 1.The stress-free design of the new car is a major selling point.
   这款新车的无应力设计是其主要卖点。
2. 2.The stress-free environment in the lab made it easy for us to conduct experiments.
   实验室中无应力的环境使我们能够轻松进行实验。
3. 3.The stress-free life style has become increasingly popular among young people.
   无应力的生活方式在年轻人中越来越受欢迎。