1.在from which 中，which指代是前面某个名词或代词。如：The village has only one well from which the villagers draw water. 这个村子仅有一口井供村民们取水。2.在from where中，where指代是前面表地点介词短语，指明详细地点方位。如：He hid himself under the bed, from where he could hear what they were talking about.   (from where = and from under the bed)3.普通情况下，where可直接引导定语从句。What is the name of the town where we stayed last night? 我们昨晚呆过那个小镇叫什么？
4.但在特定语境中，用where不如用from where。如：She climbed up to the top of the hill, from where she could have a good view of the wh ...