"Birds in a nest" 是指小鸟在鸟窝里的意思。这个表达的起源可以追溯到古英语时期，当时的词汇中有 "nest" 和 "bird" 两个词。
例句：
The birds in the nest were chirping loudly. (鸟窝里的小鸟正在大声唧唧叫。)
The mother bird carefully tended to her eggs in the nest. (母鸟小心地照顾着她在鸟窝里的蛋。)
The nest was made of twigs and pned with soft feathers for the comfort of the birds. (这个鸟窝由树枝和柔软的羽毛制成，为小鸟提供舒适。)