例句與造句

1. 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(gè)很概括的看法,且某些鳥種是例外,但一般而言一齡夏羽個(gè)體只能以還留著的幼鳥飛羽和尾羽,或大覆羽的換羽界限來(lái)區(qū)分
2. It's difficult to find rectrices in a sentence. 用rectrices造句挺難的