What distinguishes his teaching from other religious approaches to the human condition is the directness, thoroughness, and uncompromising realism with which he looks at these strains.
//主语部分开始
What（引导从句做整句的主语）
distinguishes （名词从句的动词）
his teaching （名词从句的宾语）
from other religious approaches（介词短语修饰动词“distinguishes”）
to the human condition（介词短语修饰前面的“approaches”）
//主语部分结束
is （谓语动词）
//主语的补语部分开始
the directness, thoroughness, and uncompromising realism （主语的补语，）
with which（引导从句，which指“the directness, thoroughness, and uncompromising realism”，with which 修饰从句的动词“looks at”）
he （从句的主语）
looks at （从句的谓语）
these strains.（从句的宾语）
//主语的补语部分结束
整句结构是主语+系动词+主语补语
补语部分理解的方式是：
he looks at these strains with the directness, thoroughness, and uncompromising realism
将“the directness, thoroughness, and uncompromising realism ”提前，突出和其他宗教最重要的区别
用which代替“the directness, thoroughness, and uncompromising realism ”
然后将with which 提前，引导从句说明主要区别是出现在什么情况下
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