radial air-cooled engine

例句：

1. 1.The radial tire is designed to provide better traction on uneven surfaces.
   径向轮胎设计用于在不平坦表面上提供更好的牵引力。
2. 2. Radial tires are commonly used in off-road vehicles for their ability to handle rough terrain.
   径向轮胎常用于越野车中，因为它们能够处理崎岖地形。
3. 3. The radial design of the engine helps reduce vibration and noise during operation.
   发动机的径向设计有助于减少运行中的振动和噪音。