第四章中，我们研究了鸽子颈部绿色和紫色羽毛的虹彩现象。
In the fourth chapter, we studied the iridescence phenomena of the green and purple feathers on the neck of pigeon.
在未婚夫凯西华伦陪伴下的杰西卡阿尔巴身着深紫色羽毛饰抹胸长礼服，显得宁静端庄。
Alba, with fiancee Cash Warren at her side, was serene in a deep purple strapless gown with purple feathers decorating her bodice.
在澳大利亚，一只缎蓝园丁鸟在小树枝和草叶铺成的“林荫大道”前整齐地摆上蓝色鹦鹉的羽毛、白色蜗牛的壳，还有黄色和紫色的花朵；它的眼睛呈现惹人注目的蓝色。
In Australia, in front of his stick-and-grass avenue, a male satin bowerbird, whose eyes are a striking blue, displays blue parrot feathers, white snail shells, and yellow and purple blossoms.
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