spheric crank chain

例句：

1. 1. The new car has a spherical crank chain that makes it more efficient.
   这款新车采用了球面曲柄链，使得它更加高效。
2. 2.The old bicycle used a spherical crank chain that was difficult to replace.
   旧自行车使用的是球面曲柄链，更换起来非常困难。
3. 3. The engineer designed the spherical crank chain to improve the performance of the machine.
   工程师设计了球面曲柄链，以提高机器的性能。