There was a salt-marsh that bounded part of the mill-pond.

1.没有插入语,on the edge of which 引导非限制性定语从句,修饰mill-pound..
at high water 做时间状语
不懂追问!
再问： There was a salt-marsh that bounded part of the mill-pond和we used to stand to fish for minnows在句中作什么成分？
再答： There was a salt-marsh that bounded part of the mill-pond 主句 on the edge of which, at high water, we used to stand to fish for minnows 定语从句 修饰mill-pound... which 指的是mill-pound 我们过去在 水位较高的时候站在 池边钓鱼， 这里mill-pound应该是 水池的意思吧， 不是磨坊。
再问： 那如果没有at high water 这个状语，句子是不是变成There was a salt-marsh that bounded part of the mill-pond，on the edge of which we used to stand to fish for minnows.或者There was a salt-marsh that bounded part of the mill-pond，which we used to stand to fish for minnows on the edge of. ??
再答： 是的！
再问： 谢谢你的回答，但是我还有一点没弄懂，就是为什么时间状语会放在非限定性定语从句中间的？能否举个例子说明一下？
再答： 从句和主句都有自己的 句子成分， 不影响的。 比如 What you said yesterday is wrong. 你昨天说的 是错的。。。 主语从句的时间状语 是 yesterday.. The book you bought yesterday is nice...