a covering that serves to conceal or shelter something
造句
Usually there is a distinct contrast between the black primaries and brown coverts, still evident at middle distances. 長尾水剃通常在黑色的初級飛羽與棕色的覆羽之間有著明顯的對比，在中距離的時候仍是可見的。
Its tail is long and black with gray uppertail coverts and orange brown undertail coverts. 尾羽修長黑色，尾上覆羽灰色，尾下覆羽橙褐色。