What does this story tell people?

This classical Chinese is about a northerner who doesn't understand water chestnut and knows that he is wrong, but he doesn't admit his mistake.

I covered up my mistake and made some jokes. The key sentence in the article is "others protect their own shortcomings", which is obviously correct.

This northerner's behavior is crucial, pointing out the author's intention and is also the center of the article. snatch

Living this key sentence, it is easy to generalize and extract the conclusion: people can't protect their own shortcomings, otherwise they can only

Smile and be generous. If you can't grasp the key sentences, it's easy for you to grasp the main points and the central idea of the information.

You can't get to the point, can you? Ask people to go straight to the point.