upper connecting rod

例句：

1. 1. The upper connecting rod is crucial for the engine's operation.
   上连杆对于发动机的运行至关重要。
2. 2. The engineer replaced the upper connecting rod with a new one.
   工程师用一个新的上连杆替换了旧的。
3. 3. The upper connecting rod is responsible for transmitting power from the crankshaft tothe pistons.
   上连杆负责将曲轴的动力传递给活塞。