我们的换羽毛的季节，就像飞禽的，必然是生命之中一个大的转折点。

Our moulting season, like that of the fowls, must be a crisis in our lives.

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原因在于，就如随着你观察的角度改变，变换羽毛的颜色会发生改变一样，微滴的颜色也因旋转发生改变。

For, just as the colour of an iridescent feather changes with the Angle you look at it, so the colour of a droplet can be changed by rotating it.

youdao

鸟的羽毛不会永远光洁如新，鸟类必须周期性的进行换羽，长出新的羽毛。

Feathers don't last forever. So birds periodically shed their plumage and then sprout replacements.

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