There is not a great difference between summer and winter

问题描述:

There is not a great difference between summer and winter
为什么用between,为什么用There be句型,There be句型不是指某地有某物的吗,里面有什么规律可循,能再造几个这样的句子吗,另外单独用 a great difference 和 great difference 造句吗

Although we are twins,there are great differences between us.