armature shaft oil retainer

例句：

1. 1. The engineer carefully inspected the motor shaft oil retainer to ensure it was functioning properly.
   工程师仔细检查了电机轴油封，确保其正常工作。
2. 2. The technician replaced the worn out motor shaft oil retainer with a new one.
   技师用一个新的油封替换了磨损的电机轴油封。
3. 3. The manufacturer recommends using an oil retainer on all motor shafts to prevent wear and tear.
   制造商建议在所有电机轴上使用油封，以防止磨损。