In recent years, more and more migrant workers have moved into big cities and they have been making great contributions to the development of cities.New buildings need them, roads can't be repaired without them, and the planting and protecting of trees and flowers depend on them.Indeed, they play an important role in the construction of cities in China today.

　　近年来，越来越多的农民工已经搬到大城市，他们为城市的发展做出了巨大的贡献。新的建筑物需要他们，没有他们道路无法修复，种植保护树木、花草依靠他们。事实上，在今天中国的城市建设中他们发挥了重要的作用。