1)     句中this thesis 指课文中上句中提到的 the cool temperature storage of foods Thesis 作为论题、课题解。Another development 应引伸作新发展起来的食品低温储藏解。Which 引导的从句作定语,修饰another development 其中itthis thesis


2while slow in maturing 是省略了主语和动词的让步状语从句,主语和主句的相同,完整形式应为while it was slow in maturing 主句的主语it指的是上句中提到的another development


3)句中,that in such commercialin combination with sodium bicarbonate 是宾语从句。该从句是there be 句型,其主语是a slowly acting sodium acid pyrophosphate…with sodium bicarbonate。Of the approximate formula Na2H2P2O7 介词短语作定语 修饰pyrophosphate in combination with sodium bicarbonate 介词短语作定语,也修饰pyrophosphate ordinarily used ascomponent 为分词短语作定语,也修饰pyrophosphate


4)本句是被动句,其主语是Better use tolife 谓语是is predicted。主语中介词短语to regulate ripeningto prolong useful storage life是并列的,作定语修饰Better