初三英语14.--It's very important for us to keep a good relations

C 这里涉及到人与人之间的关系
It's very important for us to keep a good relationship between classmates.
在同学之间保持良好的关系对于我们来说是非常重要的.
涉及事物之间的区别或人与人之间关系或各国之间的关系时,用between.如：
the difference between the three of them 他们三者之间的区别
the relations between various countries 各国之间的关系
among 一般用于三者或三者以上的“在……中间,在.之中”,其宾语通常是一个表示笼统数量或具有复数(或集合)意义的名词或代词.如：
They hid themselves among the trees.他们躲在树林中.
I found it among a pile of old books.我在一堆旧书中找到了它.
注：among 还用于下列情况：
(1) 用来引出最高级的比较范围.如：
The book is the best among the modern novels.在现代小说中这本是最好的.
(2) 表示“是……当中的一个”(相当于 one of).如：
I was among the first to come.我是来得最早的一个.
Paris is among the largest cities in the world.巴黎是世界上最大的城市之一.
between 一般指两者之间,其宾语往往是表示两者的名词或代词,或者是由 and 连接的两个人或物.如：
There was a fight between the two boys.这两个孩子打过一次架.
The baby crawled between his father’s legs.婴儿在他父亲的双腿中间爬.
注：在下列情况,between 可用于三者：
(1) 两个以上的人或物用 and 连接时.如：
between A,B and C 在 A、B、C 之间
(2) 涉及事物之间的区别或各国之间的关系时.如：
the difference between the three of them 他们三者之间的区别
the relations between various countries 各国之间的关系
(3) 表示“由于……合作的结果”时.如：
Between them they landed the fish.他们协力把鱼拖上了岸.
(4) 在 divide,share 等表示“分享”之类的动词之后,若接一个表示三者或三者以上的复数名词时,用 among 和 between 均可.如：
He divided his money among [between] his five sons.他把钱分给了 5 个儿子.
in the middle of 在.中间,是在一个中间点上,是物体离边缘最远的部分,或是在表面之上
Tom stands in the middle of the room.汤姆站在房间的正中间.
In the middle of the room stands a table.