英语翻译Third,primary groups are fundamental because they serve

英语翻译Third,primary groups are fundamental because they serve as powerful instruments for social control.Their members command and dispense many of the rewards that are so vital to us and that make our lives seem worthwhile.【Should the use of rewards fail,members can frequently win by rejecting or threatening to ostracize those who deviate from the primary group's norms.】For instance,some social groups employ shunning (a person can remain in the community,but others are forbidden to interact with the person) as a device to bring into line individuals whose behavior goes beyond that allowed by the particular group.其中括号里面的句子怎么理解呢?【For instance,some social groups employ shunning as a device to bring into line individuals whose behavior goes beyond that allowed by the particular group.】还有这一句话也帮忙翻译一下好不~