of the lunches we brought from our homes.
是介词短语作that的定语,we brought from our homes是lunches的定语从句,从句中的关系代词that被省略,定语从句的先行词是特指名词.
One是句子的主语,of my unforgettable memories of my school in Xinjiang 是One的定语,
is 是谓语,that是表语,of lunches we brought from our homes 是介词短语作that的定语,这儿没有表语从句.that指前面的One,即one
unforgettable memory.Do you understand?