求翻译：(3)严格执行项目监理制：委托相应专业的监理公司对项目建设实行科学管理，确保项目质量、进度、投资得到有效控制。是什么意思？

(3) strict implementation of the project supervision system: the principal company of the appropriate professional supervision of the implementation of scientific management projects to ensure project quality, progress, investment has been effectively controlled.

( 3) Strict implementation of project monitoring system: the commissioning of the corresponding professional supervision company for construction of the project scientific management, ensuring that the project quality, progress, investment has been effectively controlled.

(3) carries out the project overseeing system strictly: Entrusts the corresponding specialized overseeing company to implement the scientific management to the project construction, guarantees the project quality, the progress, the investment is under the active control.

(3) strict implementation of the project supervision system: a delegate the project construction supervision company of the appropriate professional scientific, ensure the effective control of project quality, progress and investment.

(3) strict implementation of the project supervision system: delegate on project construction supervision company of the appropriate professional scientific, ensure the effective control of project quality, progress and investment.