rectrices

常见例句

It is a very big generalization, and some species are exceptions, but generally first summer individuals can only be separated by retained juvenile remiges and rectrices or by moult limits in the greater coverts.
這是一個很概括的看法;且某些鳥種是例外;但一般而言一齡夏羽個躰衹能以還畱著的幼鳥飛羽和尾羽;或大覆羽的換羽界限來區分.
outer rectrices
外側尾羽
central rectrices
中央尾羽
rectrix
n. 鳥尾上的硬毛;舵羽