What does Luban Jingda mean?

Lu Ban Jing Da Nai means that when you think, you are usually acute and unstable. The ouchi in Lu Ban's book is that Lu Ban's thinking is sharp and unstable at ordinary times, so he wrote ouchi in the book, which Lu Ban will see every time he thinks. So what Lu Ban Jing Da Nai means is that when thinking, it is usually acute and unstable.