It means that heroes will all grow old, but their spirits will always live in people's hearts.
“A veteran never dies, he just fades away.” This was the farewell speech delivered by American five-star General MacArthur after he was dismissed by President Truman in 1951 and returned to the United States. This sentence is a lyric quoted by MacArthur in a military song: An old soldier never dies, although he has faded from the stage. Afterwards, he continued: "Like the veteran in the song, a veteran who tried to follow God's guidance to fulfill his duties ended his career and disappeared. "Goodbye"!
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"Old soldiers never die, they just fade away" in English: old soldiers never die, they just fade away.
MacArthur has 50 years of military practice experience and is known as As a "generation of veterans", he himself was once "the youngest brigadier general in the United States, the youngest principal of West Point Military Academy, and the youngest chief of staff in the history of the U.S. Army." With his exquisite military strategies and the courage to fight and win, With his courage and courage, MacArthur can be called a wizard in the history of American war.
Reference: People's Daily Online - Sun Chunlong: Veterans never die, they just wither