between是什麼意思

例句：

1、 I think the relationship between patients and doctors has got a lot less personal.

我認為醫患之間的關係變得越來越缺乏人情味。

2、 Students will be able to choose between English, French and Russian as their first foreign language.

學生可以在英語、法語和俄語中間選擇一門作為第一外語。

3、There are no significant differences between the two groups of students.

這兩組學生沒有明顯差別。

4、 There is no difference between the two in quantitative terms.

兩者在數量上毫無差別。

5、There is a fundamental difference between the two points of view.

這兩個觀點有根本區別。