From the people's point of view

Reason: Cao Gui is just a civilian. He participated in the planning and followed him to the war, so as to "beat others, then failed, and I was exhausted three times, so I overcame them" and defeated the enemy country, which fully reflected the importance of "ordinary man".

Opportunity knocks but once. "

From the ability to do things.

Reason: it is not the same type as the previous sentence. "It is now or never, and it will never come again." In a battle, it means, "One effort fails again, three efforts are exhausted, and I am exhausted, so I will overcome it." This shows the importance of mastering fighters and Cao Gui's fighting talent.

Answer finished, hope to adopt.