他们是契约外来工的后代。

They are descendants of indentured importees.

外来工子女城市就学体现教育机会均等化，也是融入城市社会的表现。

Migrant workers children's going to school in cities shows the equalization of the education chance and the inclusion of urban society.

外来工所居住的环境经常要比他们的工作更加艰难更加可怕。

Conditions in which guest workers live are often harder and more awful than their work.