working-class children与middle-class children什么意思

working-class children与middle-class children什么意思 working class childhood 什么意思? "the children had a composition class yesterday."意思 middle-class girl的意思? children什么意思? children'sday什么意思 children什么意思 class objects什么意思 world-class什么意思 class什么意思 How many children are there in your class? some children study well in my class改同义句