canyoutellmethediffirences－－－－thefourwords?用between还是among?老师说是四个单词之间的两两比较所以用between,但是另一本教辅说是三者或三者以上所以应该用among,到底是哪个啊

　　canyoutellmethediffirences－－－－thefourwords?用between还是among?

　　老师说是四个单词之间的两两比较所以用between,但是另一本教辅说是三者或三者以上所以应该用among,到底是哪个啊