第一个and是和哪一句并列啊,or后面的内容还是前面的,when后面的三个that分别是修饰那里的啊?Thehistoryofclinicalnutrition,orthestudyoftherelationshipbetweenhealthandhowthebodytakesinandutilizesfoodsub

Question

第一个and是和哪一句并列啊,or后面的内容还是前面的,when后面的三个that分别是修饰那里的啊?
The history of clinical nutrition,or the study of the relationship between health and how the body takes in and utilizes food substances,can be divided into four distinct eras:the first began in the nineteenth century and extended into the early twentieth century when it was recognized for the first time that food contained constituents that were essential for human function and that different foods provided different amounts of these essential agents.

Answer 1

1、第一个and是between……and……结构,是health和how the body takes in and utilizes food substances的并列.主要是通过句子意思来看,The history （of clinical nutrition）,or the study （of the relationship between health and how the body takes in and utilizes food substances）,history和study是并列的主语,而of the relationship （between health and how the body takes in and utilizes food substances ）是修饰study的,（between health and how the body takes in and utilizes food substances ）是对relationship的解释：什么“关系”?是——健康 与（and） 身体怎样吸收营养物质 之间（between） 的关系.
2、when引导定语从句,nineteenth century and extended into the early twentieth century .
1）、第一个that和第三个that并列引导主语从句：that food contained constituents ……,that different foods provided different amounts of these essential agents,是对when后面的it的解释
2）、第二个that引导定语从句that were essential for human function ,解释constituents （成分）.
其实你要学会把句子主干提炼出来,什么是主语、谓语、宾语,然后再看它们分别由什么结构组成,分别分析.