人们在办事中经常要签订合同。合同是两方面或几方面在办理某事时,为了确定各自的权利和义务而订立的共同遵守的条文。合同中所使用的概念要注意明确。如果合同条文中所使用的概念模糊不清,内涵和外延不确定,就会引起歧义,致使双方面或多方面发生争执。例如: 某学校总务处(甲方)与某打井队(乙方)签订了一份合同。新井打好后,井内却只有少量的水,远远不能满足三百名师生员工的各种用水。因此, People often sign contracts in their work. A contract is a commonly-observed provision for the determination of their respective rights and obligations when dealing with something. The concepts used in the contract should be clear. If the concept used in the contract clause is vague, the connotation and extension are not certain, it will cause ambiguity, leading to disputes in two aspects or multiple aspects. For example: A school general affairs office (Party A) has signed a contract with a drilling team (Party B). After the well was laid, there was only a small amount of water in the well, which could not meet the various water needs of the 300 teachers and students. therefore,