Zhu is an educator who proposed "learning from foreigners to control foreigners". Zhu is an educator who proposed "learning from foreigners to control foreigners". Zhu taught his son in the letter "Meeting with the eldest son": When making friends, judgment and choice are particularly important. Although he is a classmate, he doesn't know the difference between relatives and friends in calcium dobesilate capsules. Children are naive, imitative and weak in discrimination. The environment has a great influence on them. The influence of the environment is often realized through people's communication, especially the influence of teachers and friends. Therefore, many educators and thinkers in ancient times emphasized that children should be good at learning from teachers and choose friends carefully.