back-to-back duplex bearing

例句：

1. 1. The new car has a back-to-back double bearing system, which greatly improves its performance.
   这款新车采用了背靠背双联轴承系统，性能得到了极大的提升。
2. 2. In the construction of bridges, the use of back-to-back double bearing is very common.
   在桥梁建设中，背靠背双联轴承的使用非常普遍。
3. 3. The engineers carefully designed the back-to-back double bearing to ensure smooth operation and long service life.
   工程师们精心设计了背靠背双联轴承，以确保运行顺畅和长期服务寿命。