from which to do sth 的用法

Many ancient cultures built observatories from which to carry out celestial observations.

许多古代文明都有建造天文台观测天象。

from which 在这里当什么词性? 若拿到这两个字，对句意有影响吗?

Thanks a lot.

你的句子中的 from which to carry out celestial observations 是一种紧缩定语从句，其中的 from which 可以省略。比如：

Many ancient cultures built observatories from which to carry out celestial observations. (紧缩定语从句)

Many ancient cultures built observatories from which people could carry out celestial observations. (定语从句)

Many ancient cultures built observatories to carry out celestial observations.(不定式作定语)

当然为了意思更明确，可以在不定式前加上 for people 这样的逻辑主语：

Many ancient cultures built observatories for people to carry out celestial observations.

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擅长：英语 | 采纳率 67% | 回答于 1秒前

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