这只鸟把尾羽展成扇形。

The bird fanned out its tail feathers.

《牛津词典》

这只鸟竖起了羽毛。

The bird ruffled up its feathers.

《牛津词典》

这只鸟养得太温驯了，现在很难在野生环境中生存。

The bird is too tame now to survive in the wild.

《牛津词典》

Now, all the cat is doing is that it's an infinite loop and it's checking if I am not facing bird, - face bird, and it's -- It's constantly chasing the bird.

猫能做的就是一个死循环,并且它能检测我是不是面对着一只鸟，如果没有就转向那只鸟-,它一直不停地追逐这只鸟。

哈佛公开课 - 计算机科学课程节选