左右羽

Left and right feathers

以上为机器翻译结果，快速获取精准的人工翻译结果，建议选择有道人工翻译

1
小型鸟类一年进行一到两次换羽，在换羽期间，它们一次会替换掉9到10根左右的飞羽，而这个过程将持续几周时间。
Small birds molt once or twice a year, and they replace their 9 or 10 primary flight feathers a few at a time over the course of a few weeks.
2
脸颊部左右各一块黑色大斑，这是麻雀最易辨认的特征之一，肩羽有两条白色的带状纹。
Each piece of black face about big spot, this is most easily recognizable features of sparrows, one of two white feather shoulder belt.

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