The primary reason was skepticism that a railroad built through so challenging and thinly settled a stretch of desert,mountain,and semiarid plain could pay a profit.
(that引导的从句作skepticism的同位语)
主要原因是存在一种怀疑主义,人们怀疑途经如此富于挑战性、人口稀疏的大片沙漠、山脉和半干旱平原的一条铁路能否获得利润。
分句1:the primary…
分句2:that a railroad…
1和2嵌套
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