stationary seal ring seal seatretainer

例句：

1. 1.The car is stationary on the side of the road.
   这辆车停在路边。
2. 2.The train is stationary at the platform.
   火车停在站台上。
3. 3. The house is stationary in the middle of the street.
   房子停在街道中间。
4. 1. The seal ring is used to keep the door shut.
   密封环用来保持门关闭。
5. 2. The seal ring is made of rubber and can be replaced easily.
   密封环是由橡胶制成的，可以很容易地更换。
6. 3. The seal ring is a crucial part of the lock mechanism.
   密封环是锁机构的关键部分。
7. 1. She sat down at the table and started eating.
   她坐在桌子旁开始吃。
8. 2. He sat down for a rest after his long walk.
   他在长途步行后坐下来休息。
9. 3. The man sat down on the bench and watched the game.
   那个人坐在长凳上观看比赛。