原文：Engineering services are often handled through turn-key operations, contracts for the construction of operating facilities that are transferred to the owner when the facilities are ready to begin operations.
译文：劳务工程常常是以全部承包凡是进的成见生产设施的合同规定工程完成时

原文：Engineering services are often handled through turn-key operations, contracts for the construction of operating facilities that are transferred to the owner when the facilities are ready to begin operations.
译文：劳务工程常常是以全部承包凡是进的成见生产设施的合同规定工程完成时，将全部设施交给业主。

改进的译文：劳务工程常常是以交钥匙工程的方式进行，即以合作形式规定承建商在承建的生产设施准备投入运行时移交给业主。