maintenance of a reasonable speed

例句：

1. 1.The car needs regular maintenance to keep it running smoothly.
   这辆车需要定期维护，以保持其顺畅运行。
2. 2. The team's performance has been maintained despite the challenges they faced.
   尽管面临挑战，团队的表现仍然得到了保持。
3. 3.The housekeeper maintains a clean and orderly home environment.
   家政人员保持着一个干净有序的家庭环境。