Indeed the poor bird had good reason to be sad, for it had been caught and put into a cage close by the open window.

确实这只可怜的小鸟有理由伤心，因为他被捉进靠着打开的窗户的鸟笼里。

youdao

He feels sad. The bird flies to Micky.

他感到伤心。这只鸟飞到米奇那里。

youdao

As a child, I do not know what is sad, once I think I will always be a worry-free bird.

孩提时，我不知道什么是忧愁，曾经我认为我会永远是一只无忧的鸟儿。

youdao

This is the popular picture of the bird-watcher--a dowdy spinster displacing years of unfulfillment onto the sad pursuit of fleeting animals.

FORBES: Wings of Desire