在古代汉语中，《杞人忧天》是一则广为人知的寓言故事，其寓意深刻且耐人寻味。这则故事不仅反映了古人对自然现象的理解和思考，还蕴含着丰富的哲学内涵。本文将通过原文与译文的对照，帮助读者更好地理解这一经典故事。

原文如下：

杞国有人忧天地崩坠，身亡所寄，废寝食者。

又有忧彼之所忧者，因往晓之，曰：“天，积气耳，亡处亡气。若屈伸呼吸，终日在天中行止，奈何忧崩坠乎？”

其人曰：“天果积气，日月星宿，不当坠耶？”

晓之者曰：“日月星宿，亦积气中之有光耀者，只使坠，亦不能有所中伤。”

其人舍然大喜，晓之者亦舍然大喜。

译文如下：

There was a man from the state of Qi who worried that the sky would fall and collapse, leaving him with nowhere to stay. He neglected his sleep and food because of this worry.

Another man who heard about his concerns went to explain it to him, saying, "The sky is just accumulated air; there's no place without air. You breathe in and out every day, moving around in the sky all the time. Why do you worry about it collapsing?"

The first man asked, "If the sky really is just accumulated air, wouldn't the sun, moon, and stars also fall?"

The second man replied, "The sun, moon, and stars are also luminous objects within the accumulated air. Even if they were to fall, they wouldn't cause any harm."

Upon hearing this explanation, the first man felt relieved and very happy, and so did the one who had explained it.

通过对原文和译文的对照，我们可以看到，这则故事主要讲述了一个杞国人因为担心天空会塌下来而整日忧虑不安，甚至影响到了正常的生活。后来，有人试图安慰他，告诉他天空不过是气体构成的，并不会真的塌下来。经过解释后，杞国人终于放下了心中的顾虑，感到非常高兴。

从这个故事中，我们可以得到两点启示：首先，不要过于担忧那些不可能发生的事情；其次，当遇到问题时，应该积极寻求解决办法，而不是一味地焦虑。这些道理至今仍然具有重要的现实意义。

总之，《杞人忧天》以其简洁的语言和生动的情节，向我们传递了深刻的哲理。通过对比原文与译文，我们能够更深入地体会其中的智慧，并将其应用到实际生活中去。