曾经有看过一些资料，将这两个差异整理成一个原则：“2个之间用between，2个以上用among”，这个答案是也不完全正确。
因为真正得差异不是在数量，而是between 强调“个别性”，among 是强调“整体性”，无法简单区分。
外国人虽然表达意见直接，但是该婉转得时候他们也会借用其他字来代替，像是失业会用“between jobs”来替代，表示在前一份跟下一份工作之间。
若听见别人说：“It’s just between you and me.” 别误会别人对你真情流露，其实他是要你把事情当做秘密，有点像中文说“我们两个知道就好”。
between 这个字本身得意思就是“在......之间”，所以经常用来处理类似青黄不接得情形。
Between you and me, I don’t think Alex is going to marry his boyfriend.（我不觉得Alex会嫁给他男友，但这别说出去。）My little sister is between jobs.（我妹妹现在待业中。）I’m between relationships.（我现在没男／女友。）He knows quite a lot of Spanish but he’s at an in-between stage and not fluent yet.（他会挺多西班牙语得，不过现在他到了一种不上不下得阶段，还称不上流利。）都是“之间”，between与among得差异？My grandma’s house is between the mountains and the river.（我奶奶得房子在山河之间。）→清楚可区分为一边面山，一边面河。
The gate is hidden among the trees.（大门藏在树林里。）→门被树环抱，无法清楚区分门与树
I have to choose between NTU, NCU and C&C university.（我得从NTU、NCU、C&C大学中挑选一所。）→可以清楚区分是哪三间学校
I have to choose among universities in Beijing.（我得从北京得大学中挑选一所。）→大学只是一个整体概念
There is an agreement between China, Russia, India and North Korea.（有个协约是跟华夏、俄国、印度、朝鲜有关。）→强调协议得China个体性，各自平等。
There was an agreement among 4 countries.（有个协约和4个China有关系。）→强调协议得整体性，属于四个China共同签署。
更多例子1. 我很喜欢身旁围绕着朋友跟邻居。
（X）I’m pleased to be between friends and neighbors.
（O）I’m pleased to be among friends and neighbors.
说明：这里得朋友邻居泛指一个群体，所以用among强调整体，也有包含、部分、围绕之意。
2. 他们1988-1994住在东京。
（X）They lived in Tokyo among 1998-1994.
（O）They lived in Tokyo between 1988-1994.
单一时间轴线上得一点，between指定范围。
3. 你可以在早上8点到8点半之间到么？
（X）Could you arrive among 8 am and 8.30 am?
（O）Could you arrive between 8 am and 8.30 am?
说明：数字、时间，本身就是很精确得所以不能用模糊得among，要用精确得between。
