Half a hundred Li: It means a hundred Li, and 90 Li is half the battle. The closer the metaphor is to success, the more difficult it is. It also shows that it takes 50% work to complete the final 10% of the project. Encourage people to do things in one go, don't give up halfway.

Social practical significance: Take Shenzhou VI as an example, sharpen an arrow in ten years and succeed in an instant! Taking official career as evidence, it is easy to be a good official, and it is difficult to ensure that the evening festival will not rot. For example, science and technology are the same for officials and people, industry, agriculture and business.