I had remarked on one side of the road, at intervals of six or seven yards, a line of upright stones, continued through the whole length of the barren.
on one side of the road, at intervals of six or seven yards这两个介词短语是在从句中作什么成分呢？
谢谢老师。
这里的 on one side of the road 是地点状语， at intervals of six or seven yards 是时间频度状语。这是一个简单句，没有从句。
