radiator filler cap

例句：

1. 1. The technician replaced the faulty radiator filler cap with a new one.
   技师用一个新的替换了故障的散热器盖。
2. 2. The car's engine was running smoothly after the technician fixed the radiator filler cap.
   技师修复了散热器盖后，汽车发动机运行得非常顺畅。
3. 3. The old radiator filler cap had rusted through, requiring replacement.
   旧的散热器盖已经生锈透了，需要更换。