maintenance of canopy

例句：

1. 1. Thecar needs regular maintenance to keep it runningsmoothly.
   这辆车需要定期维护，以保持其顺畅运行。
2. 2. The old building needsmaintenance work to be done before the newone is built.
   这座旧建筑需要在新建筑建成前进行维护工作。
3. 3. The company's main goal is to maintain itscompetitive edge in the market.
   该公司的主要目标是在市场上保持其竞争优势。