Chapter 45 strip of water

During the Northern and Southern Dynasties, the Northern Zhou Dynasty in the north and the Chen State in the south were bounded by the Yangtze River. Yang Jian, the prime minister of the Northern Zhou Dynasty, abolished Emperor Zhou Jing, became emperor himself, and established the Sui Dynasty. He was determined to destroy Chen Guo, and once said: "I am the parent of the people all over the country, can I watch the people in the south suffer and not save them because there is a Yangtze River as narrow as a belt across me? Later, people used "a strip of water" to describe two places that are very close to each other with only a narrow water area.