Chapters 11 through 15 cover the dietary system, the dietary laws as well as the ritual purity laws.

1到15章节讲了饮食系统，饮食教规和宗教仪式的纯度法律。

耶鲁公开课 - 旧约导论课程节选

Some scholars theorize that the ritual purity system reflects an original concern with health or hygiene.

一些学者建立理论，认为宗教仪式的纯度系统,反映了原始的对于健康或卫生的关注。

耶鲁公开课 - 旧约导论课程节选