1st=
The library would not be useful.(if the books (in it(library)) were kept in random order)
英语的习惯啊,I saw 3 boys,the one in red is my friend什么的,the one就是‘显然’指boy；books在这儿,也‘显然’成了library中的东东,加了会显得冗繁——再说,library book放主句那句子就是books would not be useful了!
2nd＝
Association refers to:[taking the material (we want to remember)] and {relating it(the material above) to [something (we remember accurately)] }
明白层次划分了吗?
直译：联想就是：把那些我们[需要]记住的材料,和那些我们[已经]记住的材料联系在一起.
请注意区分需要和已经.
以上,