Borrowing the arrow of the straw boat can prove Mencius' argument that the right place and the right time are harmonious. The argument is as follows: Zhou Yu gave a banquet to treat Kong Ming and gave him ten days to make 100 thousand arrows. Kong Mingxiao answered, only three days later, and received a written pledge to fulfill a military order. Go back to your room and ask your friend Lu Su to pay twenty dollars for his boat. There are scarecrows on both sides of the ship, and each ship is equipped with 30 soldiers. Although Sue was puzzled, she readily agreed, and this person was also harmonious. After the preparation was completed, nothing happened one day and nothing happened the next. Until four o'clock on the third day, Kong Ming invited Sue aboard and headed straight for it. It turns out that Kong Ming has a clever plan. Three days ago, he knew that there was a thick fog on the river today, and this day was also right. At Cao Cao's camp, the ship was ordered to berth and the soldiers beat drums. Cao Jun is not used to water, so Cao Cao dare not send troops to fight, only dare to shoot with arrows, which is also a good place. As expected, a quarter of an hour later, arrows rained down. Soon, the fog cleared away. Sergeant Zhuge Liang shouted, thank you for the arrow. Then set sail. Fuck, I can't catch up. I'm furious. It's too late to regret it. Kongming returned to camp, and Zhou Yu waited for the arrow on the shore. Kong Ming smiled and answered: Twenty ships, each with five or six thousand arrows, please help yourself. The grass boat borrows an arrow, and the weather is right.