I lie awake; I have become like a bird alone on a roof.

我儆醒不睡。我像房顶上孤单的麻雀。

youdao

Hot Bird is not alone.

热鸟并不是个例。

youdao

The old man who is alone , he looked the sea, the bird and fish on as his friends, do you think he was lonely?

这个孤单的老人，他把大海，飞鸟，鱼当作自己的朋友。你认为他孤单吗？

youdao

Some people choose to walk alone. Others take part in group explorations led by bird experts.

VOA: special.2009.06.01

While the Nature study looked at how a bird flu virus could become airborne through mutations and re-assortment with other viruses, the Science study suggests mutations alone could do the trick.

CNN: Bird flu research resumes -- but not in U.S.