通过这些权利的行使使已成立合同的效力得以确定。
Chapter Three discusses the relationship between the objective elements (indication-act) and the validity of contract.第三章探讨了意思表示的客观要件即表示行为与合同效力的关系。
The validity of contract means "the legal effect" or "the legal binding force" of a contract between contracting parties.合同的效力是指合同在合同当事人之间产生的法律效力,或者说是法律拘束力。