Thinking practice is the only criterion for testing truth. Practice is the source of knowledge. Practice can be enriched. The development of theory and practice has a gradual and in-depth process. Pay attention to practice and don't belittle book knowledge. Practice under the guidance of scientific theory can temper people's will and exercise their ability. Paying attention to practice and opposing empty talk does not mean hard labor practice.

Philosophers only explain the world in different ways, and the problem is to change the world. -Marx's behavior is the beginning of knowledge, and knowledge is the result of behavior. -Tao Xingzhi can't learn to swim without going into the water. -Mao Dun Labor is the source of all knowledge. -Tao Zhu's career is a vivid unity of theory and practice. -Aristotle's theory is gray and the tree of life is evergreen. Goethe's practice must always be based on a solid theory. Leonardo da vinci's greatest goal in life is not knowledge, but action. Huxley's action is the only way to knowledge. -Bernard Shaw A man who has knowledge but doesn't practice is equal to a bee that doesn't make honey. -Problems that can't be solved by CCID theory will be solved by practice. -Feuerbach It is better to watch than to listen, and practice than to watch. -Liu Xiang, an armchair strategist, has little experience and knows nothing. -Lu you

"Take your daughter to work" (sharpen your life in practice) Since the 1990s, a plan of "take your daughter to work" has been popular in the United States. 9 ~ 15 girls can sign up, and the purpose of designing this activity is to let girls feel the taste of work in advance. Taking her daughter to work can help girls understand the real society in advance and overcome many psychological obstacles, which has achieved good results. This activity has achieved great success in many European countries, with 300 schools in Britain alone. US President Bill Clinton also said that his daughter Chelsea also needs to know how her father works. In fact, not only girls but also boys need exercise. The content of exercise is not only work practice, but also many other contents, such as the new "hardship education" and "learning agriculture from the army" In Japan, even many parents encourage their children to take risks, with the purpose of letting them experience more setbacks and get in touch with more practice, so as to cultivate and exercise their tenacious will and strong viability. Paying attention to practical training is the most important means for children to directly understand life, integrate into society, exercise their will and cultivate their self-confidence, which is very important for a person's growth. Li Siguang's investigation of Quaternary glaciers in China (practice can change wrong understanding) is an important basis for studying geological structures. Some foreigners have investigated the glaciers in China and asserted that "there are no Quaternary glaciers in China". Geologist Li Siguang put forward "Let the facts speak for themselves" and devoted great energy to the study of glaciers. 192 1 year. After he returned to China, he found the Quaternary glacial remains near Shahe County in Taihang Mountain and Kouquan in Datong Basin, Shanxi Province. Although he was denied by some foreign experts, he did not lose courage and confidence. He continued to lead students to visit Taihang Mountain, Jiuhua Mountain, Tianmu Mountain and Lushan Mountain and found many powerful evidences. 1933, Li Siguang gave a special academic lecture on Quaternary Ice Age in the Yangtze River Basin in geological society of china. After the meeting, Chinese and foreign scholars were specially invited to visit Lushan Mountain. Some foreign experts told Li Siguang privately that if these relics were found abroad, they would have been recognized as glacial relics. Since then, Li Siguang has stepped up the investigation of Quaternary glaciers, and found a large number of remains in the Yangtze River basin and Huangshan Mountain, which finally overthrew the wrong conclusions of foreigners. Its research results have played a very important role in mastering groundwater hydrology and structure and developing construction. Enlightenment from the Blind (Practice is a lifelong career) American chemist and physicist Dalton worked as a primary school teacher in Edard at the age of seventeen or eighteen. He heard that there was a Mr. John Goff here who was knowledgeable, so he took the liberty of visiting. Dalton held Goff's hand tightly and was confused by what he saw. It turned out that the experimenter praised by the local people was blind. The blind man stood up by himself and walked to a big table. The test-tube instruments on the table are varied, but they are all in good order. He effortlessly picked up the necessary instruments, filled the container, did not spill a drop of medicine, did not knock over and break the thinnest glass test tube, just like a clever magician performing an outstanding performance. In a series of skillful and accurate movements, it shows the power of knowledge and tenacious will. This made Dalton, who had long planned to do experiments, learn a lot. In this way, Dalton began his scientific research career and never left the laboratory. 1844 One night, 78-year-old Dalton trudged into his laboratory. It's a quarter to nine. For 57 years, he wrote down the weather data of the day at this time every night. His trembling hand picked up a pen, recorded the barometer reading and temperature, and wrote "light rain" in the last column. He got up contentedly and suddenly found that he didn't sign the date, so he sat down again ... A few hours later, the dawn shone into Dalton's laboratory, but the great scientist had a quiet rest. The second Prometheus Franklin,/kloc-an outstanding American scientist and politician in the 8th century, was called "the father of electricity" because of his electrical achievements such as inventing lightning rod. Before Franklin, people did not have a correct understanding of lightning. Inspired by an electrical experiment, Franklin came to the conclusion that lightning is a discharge phenomenon. In order to prove his idea, he is determined to shoot down the lightning in the sky. 1752 On a thunderstorm day in July, he and his son made a famous kite experiment. He tied a big silk handkerchief to a Chinese fir cross to make a kite. Kites are fixed with thin iron wires that protrude upwards by tens of centimeters. Thin iron wire is connected with thin hemp rope and used to fly kites. The lower end of the hemp rope is tied with a ribbon, and a copper key is hung on the ribbon. Kites carry lightning into the clouds, and lightning flashes on kites. A flash of lightning made Franklin feel a little numb in his hand holding the hemp rope. When he put his finger near the copper key, suddenly, an electric spark hit his hand. The "Temple of Heaven" was led down. Later, he collected "celestial electricity" with a Leiden bottle for experiments, which proved that "celestial electricity" can be conducted by metal like geoelectricity, melting metal and igniting alcohol. Since then, people have realized that the essence of lightning is the discharge phenomenon in the atmosphere. Franklin first put forward the idea of lightning rod, and after many experiments, he made a practical lightning rod. Kant, a great German philosopher, praised him and said, "Franklin was the second Prometheus who took fire from heaven."