相传古希腊时期，学生爱瓦特尔求拜诡辩学派的哲学家普罗塔罗拉为师，学习哲学和法律知识。爱瓦特尔提出“先付一半学费，另一半学费结业后第一次受理诉讼案件获胜后再付”。先生想了想，就与学生签订了这个交学费的合同。可是，爱瓦特尔结业后，没有参与受理诉讼案件的工作， According to legend, during the ancient Greek period, student Avatar asked Protarora, a philosopher of the sociologist, to study philosophy and legal knowledge. Aihua Teer proposed to “pay half of the tuition fees first, and after the other tuition fees are paid, the first time the suits are accepted and then the lawsuit is won.” After thinking about it, the gentleman signed a contract for this tuition with the students. However, after Abdullah’s completion, he did not participate in the acceptance of lawsuits.