permanent saving

例句：

1. 1. The company has been in operation for over 50 years, and its products are perennially popular.
   这家公司已经运营了50多年，其产品一直都很受欢迎。
2. 2. The garden is a perennial favorite among locals, attracting visitors from all over the region.
   这个花园是当地人的常去之地，吸引了来自该地区各地的游客。
3. 3.The perennial problem of traffic congestion persists despite efforts to improve infrastructure.
   尽管努力改善基础设施，但交通拥堵问题始终存在。