upper wing coverts的用法和樣例：
例句
- 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。 - 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。
