大学英语：The circumstances under which different

　　5.The circumstances under which different people live make a great difference between the way in which they live and the way in which we live， and it ought to be our business to try to understand those different circumstances so that we can better understand people of other lands.

　　三个定语从句，由under which 和 两个in which 引导，

　　第一个：under which different people live 修饰 circumstances

　　第二个：in which they live 修饰 the way

　　第三个：in which we live 修饰 the way

　　ought to = should 应该

　　business 责任，业务

　　it是形式主语，真正主语是to try to understand those different circumstances

　　目的状语从句，由so that引导

　　other lands 其它国家

　　6.Above all， we should avoid deciding what we think about people different from ourselves without first having learned a great deal about them and the kind of lives they have to live.

　　注意动词 avoid 后接动名词作宾语

　　decide 判定

　　what 引导宾语从句作deciding的宾语

　　they have to live 是省略连词的定语从句，修饰lives