extensible cover

例句：

1. 1. This tent is designed to provide an extensible cover for camping.
   这个帐篷设计用来为露营提供可扩展的覆盖物。
2. 2. The new car has a large and extensible rear seat.
   这款新车有一个大型且可扩展的后座。
3. 3. The roof of the house is made of a flexible material that can be easily extended to provide extra space during parties.
   房子的屋顶由一种可伸缩的材料制成，可以在聚会时轻松扩展以提供更多空间。