Question

请问帮我分析一下这个句子，从into开始我就不太明白了，而且好多关系代词我也不明白

Astronomers and scientists think that a black hole is a region of space(not a thing) into which matter has fallen and from which nothing can escape.

Answer 1

astronomers and scientists主语
think谓语
that引导定语从句作为句子的主语
a black hole是从句的主语
is 是从句的谓语
a region of space(not a thing)从句的宾语
into which...是从句的从句，修饰从句的宾语a region...thing)
into 来自词组fall into,掉进，只是这里将其提前到引导词which的前边。
and是来连接两个which从句，这两个从句是有先后顺序的的，都是修饰从句的宾语 a region...thing)
from 来自词组escape from.逃离，其解释等同于into.

这是一个复合从句，嵌套双层从句，所以LZ会疑惑。
天文学家和科学家认为黑洞是一个空间（不是东西），物质掉进去后无法逃脱。

Answer 2

定语从句 先行词是 a region of space。matter has fallen into a region of space; nothing can escape from a region of space
物质掉进这个地方；没有东西能从这里逃出去

Answer 3

天文学家和科学家认为黑洞是一个空间区域（不是一个物体），物质掉，没有什么能逃脱