Meaning modesty, that their own small insignificant, insignificant but indispensable.
Lei Feng: I would like to always make a screw, a person's role, for the cause of the revolution, as a machine on a screw machine as a result of the many screws and fixed, only to become a solid whole, can Run freely, play its great ability to work. Although the screw is small, its role is not underestimated. I would like to make a screw hello forever. Screw to regular maintenance and cleaning, it will not rust. People's thinking is the case, to always check will not go wrong
Screw idiomatic meaning 1. work conscientiously, obey the organization, where I go, loyal to duty, Lei Feng's "screw spirit." 2. Individuals obey the whole: ordinary people or things, dry line of love and his party.
