请详细解释A1发动机正时皮带更换的重要性，并用三个论点概括，分别用中文和英文表示。
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A1发动机正时皮带更换的重要性可以通过以下三个论点来概括：

1. **避免发动机损坏**  
   - 中文：正时皮带断裂会导致气门和活塞的碰撞，严重时会损坏发动机，导致昂贵的维修费用。  
   - English: A broken timing belt can cause valve-piston collision, leading to engine damage and costly repairs.

2. **确保发动机性能**  
   - 中文：定期更换正时皮带可以确保发动机气门的准确开闭，维持发动机的最佳性能和燃油效率。  
   - English: Regular replacement of the timing belt ensures accurate valve operation, maintaining optimal engine performance and fuel efficiency.

3. **延长发动机寿命**  
   - 中文：正时皮带的磨损会逐渐影响发动机的运行，及时更换可以延长发动机的整体寿命。  
   - English: Wear and tear on the timing belt can gradually impair engine operation; timely replacement extends the engine's overall lifespan.
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