() used to describe a product or service, especially a computer system, that is supplied in a complete form, ready for the buyer to use （尤指计算机系统）交钥匙的，完整并可立即使用的◆turnkey systems 交钥匙系统
() used to describe a large project that one company designs, builds and provides equipment for on behalf of another, so that it is completely ready to use at the end of the contract 交钥匙的（指一家公司为另一家公司设计、建造并提供设备，以便合同结束时可立即投入使用）◆We provide our clients with a complete turnkey operation. 我们为客户提供完整的交钥匙作业。◆a turnkey contract to build an airport terminal 建设机场航站楼的交钥匙合同