1. 杞国有人忧天地崩坠

– A man in the state of Qi was worried about the collapse of the heavens and the earth.

2. 身亡所寄

– His life had no place to rely on.

3. 乃废寝食

– He therefore neglected his sleep and food.

4. 卿试忧之

– Why don’t you try to worry about it?

5. 其为忧也

– The worry he felt was great.

6. 亦以忧死

– He might even worry himself to death.

7. 而天地所为

– But the heavens and the earth were not created by humans.

8. 无损毫发

– They would not be damaged in the slightest.

9. 吾是以知其不可忧也

– Therefore, I know that there is no need to worry about it.

这个成语通过描述一个杞国人担心天塌地陷的故事，讽刺了那些不必要的忧虑和担忧。在现代社会，它常用来告诫人们不要为一些不切实际的事情过分担忧。