"人们直到失去后才意识到他们所拥有的。像肯尼迪总统，没有人能比得上他，披头士乐队，还有我的偶像埃尔维斯·普雷斯利。我是拳击界的埃尔维斯。"

Simplified Meaning:

Often, people don't appreciate the value of something while they have it, recognizing its worth only after it's taken away. For example, when President Kennedy was alive, many might not have fully understood his impact and leadership. Only after his tragic death did people deeply appreciate his contributions. The same can be said for famous musical legends like the Beatles and Elvis Presley. Their extraordinary talent and influence were truly recognized by many only after their careers ended. In the same way, a boxing champion might be overlooked in their lifetime, but their unique skills and achievements are celebrated more after they retire. This tells us to cherish and value people and moments while we still have them, instead of waiting until they are gone to see their true significance.