吕蒙是三国时代的吴国将军，他虽然很勇敢，打了很多胜仗，但读的书不多。
有一次，孙权叫他来，告诉他：“你现在不光要带兵打仗，还要管理很多事，应该多读书才好。”
吕蒙有点为难地说：“可是……我每天都很忙，可能没时间读书！”
孙权说：“我又不是让你成为大学问家！我的工作比你忙多了，但我年轻的时候就看了很多书，现在又学了很多军事知识，这些都对我很有帮助。你如果多读书，一定也能学到更多。”
听了孙权的话，吕蒙决定好好学习。
后来，他的学问变得非常好，连一些学者都不如他。
有一天，鲁肃经过吕蒙的驻地。
因为以前鲁肃觉得吕蒙没什么学问，所以不想去见他。
但是有人告诉鲁肃：“吕将军现在不一样了，你应该去看看他。”
鲁肃半信半疑地去见吕蒙。
结果，吕蒙不仅能讲很多军事策略，还给鲁肃出了几个对付关羽的办法。
鲁肃非常惊讶，拍拍吕蒙的背，说：“我以为你只会打仗，没想到你的学问这么好。”
鲁肃很高兴地称赞吕蒙：“你的学问真是太好了，不再是以前那个吕蒙了。”
吕蒙听到夸奖也很得意，他说：“人和人分开三天，再见面就应该用新的眼光看待他。”
现在，“另眼相待”这个成语就是用来形容别人进步很快，不能再用老眼光看他了。
Lü Meng was a general of the Kingdom of Wu during the Three Kingdoms period. He was very brave and won many battles, but he did not read many books.
Once, Sun Quan called him and said, "You should not only lead soldiers and fight wars now, but also manage many things. It is better to read more books."
Lü Meng hesitated and said, "But... I am very busy every day and may not have time to read books!"
Sun Quan said, "I'm not asking you to become a great scholar! My work is much busier than yours, but when I was young, I read many books and now I have learned a lot of military knowledge. These are all very helpful to me. If you read more books, you will surely learn more too."
After listening to Sun Quan's words, Lü Meng decided to study hard.
Later, his knowledge became so good that even some scholars were not as good as him.
One day, Lu Su passed by Lü Meng's camp.
Because Lu Su thought Lü Meng had no knowledge before, he didn't want to see him.
But someone told Lu Su, "General Lü is different now. You should go and see him."
Lu Su went to see Lü Meng half-believingly.
As a result, Lü Meng could not only talk about many military strategies, but also gave Lu Su several ways to deal with Guan Yu.
Lu Su was very surprised and patted Lü Meng on the back, saying, "I thought you could only fight wars, but I didn't expect your knowledge to be so good."
Lu Su happily praised Lü Meng, "Your knowledge is really good. You are no longer the same Lü Meng as before."
Lü Meng was also proud when he heard the compliment. He said, "When people are apart for three days, they should look at each other with new eyes when they meet again."
Now, the idiom 'look with new eyes' is used to describe someone who has made rapid progress and should not be looked at with old eyes anymore.
