Senses
百年树人/ 百年樹人 it takes a century to train a person
It takes many years to cultivate talented people or raise children to be upstanding citizens; often used with 十年树木 to emphasize that education is a long-term project
It takes many years to cultivate talented people or raise children to be upstanding citizens; often used with 十年树木 to emphasize that education is a long-term project