翻译：合同是指双方或多方达成的一种约定，用于规定彼此之间的权利和义务。在工程管理中，合同是工程项目的基础，它规定了工程的实施方式、工程质量要求、工程进度、工程费用等方面。

A contract refers to an agreement reached between two or more parties to specify their respective rights and obligations. In engineering management, a contract is the foundation of an engineering project, which sets out the implementation methods, quality requirements, project schedule, project cost, and other aspects of the project.