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The next sentence of "Young people know that the world is difficult" is: "Looking at the mountains in the north of the Central Plains", which comes from Lu You's "The Book of Anger 15" in the Song Dynasty. The whole poem is:
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When I was young, I didn't know the world was so difficult. Looking north at the Central Plains, the heroic spirit of recovering the homeland is as strong as a mountain.
I remember beating up the nomads from Guazhou and releasing warships on a snowy night. The autumn wind swept Ma Benteng, recovering the good news of the big three passes.
I used to look forward to the Great Wall in Wan Li, but now my temples are all white. It is empty talk to look forward to the Northern Expedition and the recovery.
A model really lives up to her reputation. Who, like Zhuge Liang, tried his best to lead the three armies into the Han Dynasty and set the northern Central Plains?
To annotate ...
Book complaints: write your own complaints. Book: write.
Early years: early years, when you are young. That: that is, "where" things are difficult: it means that the great cause of resisting gold has been repeatedly destroyed.
"Central Plains" sentence: Looking at the Central Plains in the north, the heroic spirit of recovering the homeland is as strong as a mountain. Looking north at the central plains, the inversion of "looking north at the central plains" Qi, spirit.
Iron horse: A war horse in armor.
Big Three Pass: In the southwest of Baoji, Shaanxi, it was the western border of Song and Jin Dynasties.
The Great Wall is a metaphor for a general who can guard the border. The Biography of Nan Shi Tan Daoji contains an attempt to kill the general Tan Daoji. Before his execution, Tan angrily said, "Bad Wan Li Great Wall!"
Senile temple: old and thin white hair. Spot: refers to black hair mixed with white hair.
Teacher's model: In March of the fifth year of his reign (227), Zhuge Liang wrote a teacher's model before sending troops to attack Wei, expressing his strong determination to "reward the three armies, set the Central Plains in the north" and "revive the Han Dynasty and return the old capital".
Shi Ming: This name has been passed down to later generations.
K: Yes.
Equality: originally refers to the second place between brothers. The metaphor here is that the characters are equal, and it is difficult to distinguish the good from the bad.