four-flanged shutter

例句：

1. 1. The four-flanged shutters on the window are very old and need to be replaced.
   窗户上的四瓣窗非常旧，需要更换。
2. 2. The antique shop has a display of four-flanged shutters that are quite rare.
   古董店展示了一些非常罕见的四瓣窗。
3. 3. The new design uses four-flanged shutters to improve energy efficiency.
   新设计使用了四瓣窗以提高能源效率。