请帮忙划分英语句子结构 3、In addition to having to be a g3、In addition to having to be a generalist while specializing in what may seem to be a narrow field,the researcher is faced with the problem of primary mat
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3、In addition to having to be a generalist while specializing in what may seem to be a narrow field,很长的介词短语.需要细分一下,having to be又是动名词短语,最In addition to里介词to的介词宾语.然后,又由 while引出一个时间状语,what may seem to be a narrow field是一个完整的宾语从句,作in的宾语.
the researcher is faced with the problem of primary materials
that have little or no documentation.定语从句.
4、The primary reason was skepticism 主句
that a railroad （built through so challenging and thinly settled a stretch of desert,mountain,and semiarid plain） could pay a profit.定语从句,虽然长,但结构简单.括号中的成分是过去分词短语,作定语,修饰定语从句的主语railroad.