The unemployment rate is the number of unemployed workers expressed as a percentage of a country's labour force.失业率是以失业人数占一国劳动力的百分数来表达的。There is an increasing injection into the labour force of women.有越来越多的妇女投入劳动大军。The labour force in our mine is running down rapidly.我们矿上的劳动力正在迅速减少。