2. Yu Yu controls chariots and horses; Driver: Imperial. Feudal society refers to the management or rule of superiors over subordinates: national subjugation. Yuzhong. Feudal society refers to the emperor: the gift of the empire. Orders. Complaint. Resist: defend. Keep out the cold. Defend the enemy.
3. What demonstrative pronoun? That; That (as opposed to "this"): At that time. One by one. This and that. Personal pronouns. The other party; He: Know yourself and yourself. He retreated and I went in.
4. What service [y ‖] needs to do for the government: labor. Corvee forced drive; Order: slavery. Servant. The old name refers to the servant. Battle: The Battle of Pingxingguan.