Simone从句类型？
的有关信息介绍如下：
They lived underground, where they kept machines running so that the Eloi would be happy and well fed.
英文把这个where引导的从句叫做关系从句（relative clause）。
两句话有重合的元素，就可以用关系从句关联起来。
比如上面这句话可以理解成是由下面两句合并而成。
1. They lived underground.
2. They kept machines running underground so that the Eloi would be happy and well fed.
合并成关系从句第一步，把第2句的重合部分改写成关系词，这里underground是副词，表示地点，因此改为where.
They kept machines running where so that the Eloi would be happy and well fed.
第二步，把关系词提到从句句首。
where they kept machines running so that the Eloi would be happy and well fed.
第三步，与主句合并。
They lived underground, where they kept machines running so that the Eloi would be happy and well fed.
