shutter
noun [ C ] uk/ˈʃʌt.ər/ us/ˈʃʌt̬.ɚ/ (also )
(PHOTOGRAPHY)
（照相机的）快门
the part of a camera that opens temporarily to allow light to reach the film when a photograph is being taken
(WINDOW COVER)
（窗户的）活动遮板，护窗板
a wooden cover on the outside of a window that prevents light or heat from going into a room or heat from leaving it
Shutters usually come in pairs and are hung like doors on hinges. 窗戶遮板通常是成对的，像门一样挂在铰链上。
（窗户的）防护栏;卷帘铁门
a metal covering that protects the windows and entrance of a shop from thieves when it is closed