Definition of すいしんしゃ
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(n) promoter; instigator; driving force; pioneer; leader
調査担当者はどのルートが一番容易に、すなわち一番安上がりに作れるかも、鉄道の推進者にアドバイスしうるであろう。
The surveyor could also advise the promoters which route could be most easily―and therefore most cheaply―constructed.