shaft journal

例句：

1. 1. The shaft journal is the heart of the machine.
   轴心是机器的核心。
2. 2. The journals are used to keep the shaft aligned.
   轴承用于保持轴对齐。
3. 3. The journals are vital for maintaining the smooth operation of the machine.
   轴承对于保持机器的平滑运行至关重要。