coverts

常見(jiàn)例句

Usually there is a distinct contrast between the black primaries and brown coverts, still evident at middle distances.
長(zhǎng)尾水剃通常在黑色的初級(jí)飛羽與棕色的覆羽之間有著明顯的對(duì)比，在中距離的時(shí)候仍是可見(jiàn)的。
Its tail is long and black with gray uppertail coverts and orange brown undertail coverts.
尾羽脩長(zhǎng)黑色，尾上覆羽灰色，尾下覆羽橙褐色。