proper rotation

例句：

1. 1. The car needs aproper rotation to ensure its smooth operation.
   汽车需要适当旋转以确保其顺畅运行。
2. 2. During theconstruction phase, it's important toperform proper rotation to prevent accidents.
   在施工阶段，进行适当的旋转以防止事故的发生。
3. 3. Themachine requires proper rotation to maintain its efficiencyand longevity.
   这台机器需要适当旋转以保持其效率和寿命。