Who can tell me the characteristics of engineering definition?

A project in a broad sense is a project, and a project in a narrow sense is a project. Projects constitute projects, and projects contain many projects. The project consists of many projects. A project consists of one or several unit projects, and a unit project consists of several subprojects. For example, a residential district is composed of 10 building, each building is a unit project, and the civil engineering, water supply and drainage and electricity of each building are several sub-projects. It is the abbreviation of development and construction project. Actual habits are called projects, such as monitoring, supervision, construction and other time periods are generally called "projects". Engineering is a very broad concept. Building roads, Gai Lou, high-speed railway, building houses, building chemical plants and transporting gas from west to east can all be called projects. On weekdays, when most of our friends say doing engineering, they should mean contracting some specific work of civil construction, such as installing doors; Paint the exterior wall; Digging drainage pipes; Community greening and other construction work. How to do the project is a very complicated problem, but it can be roughly divided into three parts: design, procurement and construction.