casing [ˈkeɪsɪŋ]

以下由轻松背单词网站提供

附加级

n.框；壳；罩；套

This wire has a plastic casing. 这种电线外包塑料。来自《简明英汉词典》
There is a window fitting in a casing. 有一扇装在框内的窗。来自《简明英汉词典》