To explain what they have seen,they build a theory about the

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To explain what they have seen,they build a theory about the way in which things happen and the causes and effects.帮我分析一下这句话.结构等.
but if ,like Hawing ,they are studing soming that is too large or too difficult to observe directly,they will use a model to test the theory.急用

[To explain what they have seen](1),they build a theory (about the way 【in which things happen】(2) and 【the causes and effects.】(3))
【主句】they build a theory
其中：
前面(1)目的状语,其中what they have seen是名词从句,做explain的宾语.
后面build a theory,theory的修饰成分为about……而且about了两种东西,一是the way,二是 "causes & effects"
(2)定语从句修饰the way 即：things happen in the way
(3)the causes and effects.是一个整体,意思是“原因和结果”或“起因和影响”
[为了解释他们所看到的],他们建立了一套理论(关于方式[事情发生的方式]和[原因和结果])
【翻译】为了解释他们看到的东西,他们创立了一种理论——它解释了现象如何产生、产生的原因及其影响.
but if [,like Hawing ,](1)they are studing soming (that is too large or too difficult to observe directly)(2),they will use a model [to test the theory](3).
【主要结构】 [but if they are studying something (从句)],they will use……
(1)插入语注释的作用,说例如hawing
(2)that定语从句,修饰something,结构为 too ...to 太大太难以至于不能直接观测到
(3)目的状语
整个句子前半句 If 从句,为条件状语,如果……后半句为主句
【翻译】
但是如果和霍金的情况一样,研究的东西太广或太难以至于不能直接进行观测,他们就会用模型来检验理论.

To explain what they have seen,they build a theory about the what have they seen?they‘ve seen a —— ——该怎么填 what have they seen?they‘ve seen a —,—里该怎么填 They are going to build a b( )over the river they have never seen the film___?A.haven't they B.did they c 英语翻译What they have revealed only supports the theory that pe they have the f--- to do what they think best. The man will explain the rules to ----they have received man 英语上的几个问题they have come up with lots of ideas to explain the Two students are talking about the movie they have just seen What is his cousin like?改同义句 They have a medium build.改同义句 They have never seen the man before,haven't they?