1, a Chinese idiom, pinyin is Jiānbēq and Ngyě, also known as space clearing. It means to strengthen the fortifications and make the fortress strong; Clean up and collect food crops and important materials in the field. After going deep, it makes the enemy more difficult to deal with, consumes strength and gains nothing. From the biography of the reflection of Shu Wei Xun.

2. Idioms and allusions:

At the end of the Eastern Han Dynasty, Cao Cao occupied Yanzhou after suppressing the Yellow Scarf Army, and then moved eastward to capture Xuzhou.

Zhang Miao, a strongman in Yanzhou, took the opportunity to collude with Lu Bu, a separatist force, and broke through most parts of Yanzhou in one fell swoop, occupying the important town of Puyang. Cao Cao rushed back from Xuzhou and launched a counterattack against Lu Bu stationed in Puyang. Lu Bu was fierce, and the two sides were deadlocked for a long time. Cao Cao couldn't win at the moment.

Just then, Xuzhou Shoujiang Tao Qian died of illness and gave Xuzhou to Liu Bei. Cao Cao was even more impatient and decided to seize Xuzhou first and then come back to destroy Lu Bu. Counselor Xun _ heard about it and came to dissuade him. He said to Cao Cao: "When Emperor Gaozu Liu Bang fought for the world, he should first guard Guanzhong;" When Emperor Guangwu Liu Xiu pacified the world, he first occupied Hanoi. They do this in order to control the world, which is deeply rooted. So although they also suffered some setbacks and failures, they finally succeeded because they didn't lose their roots at all. In the same way, Yanzhou is your foundation. Although it is broken, it is easier to save strength. Xuzhou, on the other hand, is said to have organized manpower to grab and cut wheat outside the city and transport it to the city, which shows that they are prepared for possible battles. After harvesting the grain, the other side will inevitably strengthen the fortifications and strengthen the camp, waiting for you to hit him. If we really send troops to attack Xuzhou now, then it will be impossible to attack and there will be no gains. Within ten days, the whole army was defeated without fighting. After weighing the pros and cons, I think it's better not to hit Xuzhou first. Please think it over. "

After listening to Xun _' s suggestion, Cao Cao felt very reasonable, so he cancelled the plan to attack Xuzhou and concentrated on fighting Lu Bu. Soon, Cao Cao defeated Lu Bu and pacified Yanzhou.