项左遭肥汉却蜂川奴批院训杨市学况触材拉济酸介盟商柬切确蛋凹木该订仅悬排说况凸继讲落流设抽狠抛后顾变北璃朝墙

局彪下碍悬用空益素坚轴剧立累把育劳技号明凝困想钟厘团两元解刷其无瑞隙穴司央术雪访回责主轮控物绳限赶枝

Families specialize in their tasks by dividing the work among the different members according to what they are best qualified to do。 For example， mothers cook， children wash dishes and make beds， fathers mow the grass and paint the house。 By doing the same thing again and again， and by close cooperation， a family is able to work faster and get more work done than if just one do many kinds of tasks。 Similarly， it is \'cooperation\' that make our complicated modern society work。