"as free as a bird"意为 "像鸟儿一样自由"，用来形容自由自在、无拘无束、非常自由的状态。

【例句】
Now that I've got my divorce I feel as free as a bird.
由于我已经离婚，我觉得自由自在了。

When I finished my entrance exams, I felt as free as a bird.
入学考试考完后，我感到无比的轻松。