How to understand the line "Death is a test of life" in My Father's Generation and Poems?

The understanding of the line "Death is a test of life" in "My Father and I" and "Poetry" is that the best thing about life is that when you stop living, you can still serve the people with everything you have created.

Life is something that can burn. Death is the proof of life. The universe makes death small. Small dust is the beginning of the universe. Ordinary smallness is the beginning of greatness.

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The first generation of astronauts made a difficult start in the face of technical blockade and sweated in the face of tough environment. China finally got rid of the plight of being beaten for backwardness.

Now, half a century has passed, and the technology and craft to promote "Dongfanghong-1" have already been updated. However, from this perspective, the space industry has been going on, and their spirit has been passed down from generation to generation, just like a Kongming lantern rising in Ran Ran, which has helped those dreams of exploring space to fly further and higher places.